diff --git a/sequencer/addrqueue.go b/sequencer/addrqueue.go
index e6acf90b03..684a060aed 100644
--- a/sequencer/addrqueue.go
+++ b/sequencer/addrqueue.go
@@ -32,11 +32,12 @@ func newAddrQueue(addr common.Address, nonce uint64, balance *big.Int) *addrQueu
 	}
 }
 
-// addTx adds a tx to the addrQueue and updates the ready a notReady Txs. Also if this tx matches
-// with an existing tx with the same nonce, we return in the replacedTx the one with lower gasPrice.
-// The replacedTx will be later set as failed in the pool
-func (a *addrQueue) addTx(tx *TxTracker) (newReadyTx, prevReadyTx, discardedTx *TxTracker, dropReason error) {
-	var disTx *TxTracker
+// addTx adds a tx to the addrQueue and updates the ready a notReady Txs. Also if the new tx matches
+// an existing tx with the same nonce but the new tx has better or equal gasPrice, we will return in the replacedTx
+// the existing tx with lower gasPrice (the replacedTx will be later set as failed in the pool).
+// If the existing tx has better gasPrice then we will drop the new tx (dropReason = ErrDuplicatedNonce)
+func (a *addrQueue) addTx(tx *TxTracker) (newReadyTx, prevReadyTx, replacedTx *TxTracker, dropReason error) {
+	var repTx *TxTracker
 
 	if a.currentNonce == tx.Nonce { // Is a possible readyTx
 		// We set the tx as readyTx if we do not have one assigned or if the gasPrice is better or equal than the current readyTx
@@ -44,19 +45,18 @@ func (a *addrQueue) addTx(tx *TxTracker) (newReadyTx, prevReadyTx, discardedTx *
 			oldReadyTx := a.readyTx
 			if (oldReadyTx != nil) && (oldReadyTx.HashStr != tx.HashStr) {
 				// if it is a different tx then we need to return the replaced tx to set as failed in the pool
-				disTx = oldReadyTx
+				repTx = oldReadyTx
 			}
-			if a.currentBalance.Cmp(tx.Cost) >= 0 { //
+			if a.currentBalance.Cmp(tx.Cost) >= 0 {
 				a.readyTx = tx
-				return tx, oldReadyTx, disTx, nil
+				return tx, oldReadyTx, repTx, nil
 			} else { // If there is not enough balance we set the new tx as notReadyTxs
 				a.readyTx = nil
 				a.notReadyTxs[tx.Nonce] = tx
-				return nil, oldReadyTx, disTx, nil
+				return nil, oldReadyTx, repTx, nil
 			}
 		} else { // We have an already readytx with the same nonce and better gas price, we discard the new tx
-			disTx = tx
-			return nil, nil, disTx, nil
+			return nil, nil, nil, ErrDuplicatedNonce
 		}
 	} else if a.currentNonce > tx.Nonce {
 		return nil, nil, nil, runtime.ErrIntrinsicInvalidNonce
@@ -64,16 +64,16 @@ func (a *addrQueue) addTx(tx *TxTracker) (newReadyTx, prevReadyTx, discardedTx *
 
 	nrTx, found := a.notReadyTxs[tx.Nonce]
 	if !found || ((found) && (tx.GasPrice.Cmp(nrTx.GasPrice) >= 0)) {
+		a.notReadyTxs[tx.Nonce] = tx
 		if (found) && (nrTx.HashStr != tx.HashStr) {
 			// if it is a different tx then we need to return the replaced tx to set as failed in the pool
-			disTx = nrTx
+			repTx = nrTx
 		}
-		a.notReadyTxs[tx.Nonce] = tx
+		return nil, nil, repTx, nil
 	} else {
-		disTx = tx
+		// We have an already notReadytx with the same nonce and better gas price, we discard the new tx
+		return nil, nil, nil, ErrDuplicatedNonce
 	}
-
-	return nil, nil, disTx, nil
 }
 
 // ExpireTransactions removes the txs that have been in the queue for more than maxTime
diff --git a/sequencer/addrqueue_test.go b/sequencer/addrqueue_test.go
index 9f0a7405b1..d39ce5a356 100644
--- a/sequencer/addrqueue_test.go
+++ b/sequencer/addrqueue_test.go
@@ -13,14 +13,15 @@ type notReadyTx struct {
 }
 
 type addrQueueAddTxTestCase struct {
-	name                string
-	hash                common.Hash
-	nonce               uint64
-	gasPrice            *big.Int
-	cost                *big.Int
-	expectedReadyTx     common.Hash
-	expectedNotReadyTx  []notReadyTx
-	expectedDiscardedTx common.Hash
+	name               string
+	hash               common.Hash
+	nonce              uint64
+	gasPrice           *big.Int
+	cost               *big.Int
+	expectedReadyTx    common.Hash
+	expectedNotReadyTx []notReadyTx
+	expectedReplacedTx common.Hash
+	err                error
 }
 
 var addr addrQueue
@@ -36,7 +37,7 @@ func processAddTxTestCases(t *testing.T, testCases []addrQueueAddTxTestCase) {
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
 			tx := newTestTxTracker(tc.hash, tc.nonce, tc.gasPrice, tc.cost)
-			newReadyTx, _, replacedTx, _ := addr.addTx(tx)
+			newReadyTx, _, replacedTx, err := addr.addTx(tx)
 			if tc.expectedReadyTx.String() == emptyHash.String() {
 				if !(addr.readyTx == nil) {
 					t.Fatalf("Error readyTx. Expected=nil, Actual=%s", addr.readyTx.HashStr)
@@ -60,17 +61,27 @@ func processAddTxTestCases(t *testing.T, testCases []addrQueueAddTxTestCase) {
 				}
 			}
 
-			if tc.expectedDiscardedTx.String() == emptyHash.String() {
+			if tc.expectedReplacedTx.String() == emptyHash.String() {
 				if !(replacedTx == nil) {
-					t.Fatalf("Error discardedTx. Expected=%s, Actual=%s", tc.expectedDiscardedTx, replacedTx.HashStr)
+					t.Fatalf("Error replacedTx. Expected=%s, Actual=%s", tc.expectedReplacedTx, replacedTx.HashStr)
 				}
 			} else {
-				if (replacedTx == nil) || ((replacedTx != nil) && !(replacedTx.Hash == tc.expectedDiscardedTx)) {
+				if (replacedTx == nil) || ((replacedTx != nil) && !(replacedTx.Hash == tc.expectedReplacedTx)) {
 					replacedTxStr := "nil"
 					if replacedTx != nil {
 						replacedTxStr = replacedTx.HashStr
 					}
-					t.Fatalf("Error discardedTx. Expected=%s, Actual=%s", tc.expectedDiscardedTx, replacedTxStr)
+					t.Fatalf("Error replacedTx. Expected=%s, Actual=%s", tc.expectedReplacedTx, replacedTxStr)
+				}
+			}
+
+			if tc.err == nil {
+				if err != nil {
+					t.Fatalf("Error returned error. Expected=nil, Actual=%s", err)
+				}
+			} else {
+				if tc.err != err {
+					t.Fatalf("Error returned error. Expected=%s, Actual=%s", tc.err, err)
 				}
 			}
 		})
@@ -101,7 +112,7 @@ func TestAddrQueue(t *testing.T) {
 			expectedNotReadyTx: []notReadyTx{
 				{nonce: 2, hash: common.Hash{0x2}},
 			},
-			expectedDiscardedTx: common.Hash{0x11},
+			expectedReplacedTx: common.Hash{0x11},
 		},
 		{
 			name: "Replace readyTx for the same tx 0x1 with best gasPrice", hash: common.Hash{0x1}, nonce: 1, gasPrice: new(big.Int).SetInt64(8), cost: new(big.Int).SetInt64(5),
@@ -125,7 +136,7 @@ func TestAddrQueue(t *testing.T) {
 				{nonce: 2, hash: common.Hash{0x2}},
 				{nonce: 4, hash: common.Hash{0x44}},
 			},
-			expectedDiscardedTx: common.Hash{0x4},
+			expectedReplacedTx: common.Hash{0x4},
 		},
 		{
 			name: "Replace tx with nonce 4 for the same tx 0x44 with best GasPrice", hash: common.Hash{0x44}, nonce: 4, gasPrice: new(big.Int).SetInt64(4), cost: new(big.Int).SetInt64(5),
@@ -134,7 +145,7 @@ func TestAddrQueue(t *testing.T) {
 				{nonce: 2, hash: common.Hash{0x2}},
 				{nonce: 4, hash: common.Hash{0x44}},
 			},
-			expectedDiscardedTx: common.Hash{},
+			expectedReplacedTx: common.Hash{},
 		},
 		{
 			name: "Add tx 0x22 with nonce 2 with lower GasPrice than 0x2", hash: common.Hash{0x22}, nonce: 2, gasPrice: new(big.Int).SetInt64(1), cost: new(big.Int).SetInt64(5),
@@ -143,7 +154,8 @@ func TestAddrQueue(t *testing.T) {
 				{nonce: 2, hash: common.Hash{0x2}},
 				{nonce: 4, hash: common.Hash{0x44}},
 			},
-			expectedDiscardedTx: common.Hash{0x22},
+			expectedReplacedTx: common.Hash{},
+			err:                ErrDuplicatedNonce,
 		},
 	}
 
diff --git a/sequencer/dbmanager.go b/sequencer/dbmanager.go
index d12baca844..b47de338ef 100644
--- a/sequencer/dbmanager.go
+++ b/sequencer/dbmanager.go
@@ -139,21 +139,20 @@ func (d *dbManager) addTxToWorker(tx pool.Transaction) error {
 	if err != nil {
 		return err
 	}
-	replacedTx, dropReason, isWIP := d.worker.AddTxTracker(d.ctx, txTracker)
+	replacedTx, dropReason := d.worker.AddTxTracker(d.ctx, txTracker)
 	if dropReason != nil {
 		failedReason := dropReason.Error()
 		return d.txPool.UpdateTxStatus(d.ctx, txTracker.Hash, pool.TxStatusFailed, false, &failedReason)
 	} else {
-		if isWIP {
-			return d.txPool.UpdateTxWIPStatus(d.ctx, tx.Hash(), true)
-		}
 		if replacedTx != nil {
-			failedReason := "duplicated nonce"
-			return d.txPool.UpdateTxStatus(d.ctx, txTracker.Hash, pool.TxStatusFailed, false, &failedReason)
+			failedReason := ErrReplacedTransaction.Error()
+			error := d.txPool.UpdateTxStatus(d.ctx, replacedTx.Hash, pool.TxStatusFailed, false, &failedReason)
+			if error != nil {
+				log.Warnf("error when setting as failed replacedTx(%s)", replacedTx.HashStr)
+			}
 		}
+		return d.txPool.UpdateTxWIPStatus(d.ctx, tx.Hash(), true)
 	}
-
-	return nil
 }
 
 // BeginStateTransaction starts a db transaction in the state
diff --git a/sequencer/errors.go b/sequencer/errors.go
index 0dd8547276..afb5efec44 100644
--- a/sequencer/errors.go
+++ b/sequencer/errors.go
@@ -11,4 +11,9 @@ var (
 	ErrEffectiveGasPriceReprocess = errors.New("effective gas price requires reprocessing the transaction")
 	// ErrZeroL1GasPrice is returned if the L1 gas price is 0.
 	ErrZeroL1GasPrice = errors.New("L1 gas price 0")
+	// ErrDuplicatedNonce is returned when adding a new tx to the worker and there is an existing tx
+	// with the same nonce and higher gasPrice (in this case we keep the existing tx)
+	ErrDuplicatedNonce = errors.New("duplicated nonce")
+	// ErrReplacedTransaction is returned when an existing tx is replaced by a new tx with the same nonce and higher gasPrice
+	ErrReplacedTransaction = errors.New("replaced transaction")
 )
diff --git a/sequencer/interfaces.go b/sequencer/interfaces.go
index f5a2bc62de..49ea5a512a 100644
--- a/sequencer/interfaces.go
+++ b/sequencer/interfaces.go
@@ -87,7 +87,7 @@ type workerInterface interface {
 	GetBestFittingTx(resources state.BatchResources) *TxTracker
 	UpdateAfterSingleSuccessfulTxExecution(from common.Address, touchedAddresses map[common.Address]*state.InfoReadWrite) []*TxTracker
 	UpdateTx(txHash common.Hash, from common.Address, ZKCounters state.ZKCounters)
-	AddTxTracker(ctx context.Context, txTracker *TxTracker) (replacedTx *TxTracker, dropReason error, isWIP bool)
+	AddTxTracker(ctx context.Context, txTracker *TxTracker) (replacedTx *TxTracker, dropReason error)
 	MoveTxToNotReady(txHash common.Hash, from common.Address, actualNonce *uint64, actualBalance *big.Int) []*TxTracker
 	DeleteTx(txHash common.Hash, from common.Address)
 	HandleL2Reorg(txHashes []common.Hash)
diff --git a/sequencer/mock_worker.go b/sequencer/mock_worker.go
index 785addc7ce..1262c09023 100644
--- a/sequencer/mock_worker.go
+++ b/sequencer/mock_worker.go
@@ -21,13 +21,12 @@ type WorkerMock struct {
 }
 
 // AddTxTracker provides a mock function with given fields: ctx, txTracker
-func (_m *WorkerMock) AddTxTracker(ctx context.Context, txTracker *TxTracker) (*TxTracker, error, bool) {
+func (_m *WorkerMock) AddTxTracker(ctx context.Context, txTracker *TxTracker) (*TxTracker, error) {
 	ret := _m.Called(ctx, txTracker)
 
 	var r0 *TxTracker
 	var r1 error
-	var r2 bool
-	if rf, ok := ret.Get(0).(func(context.Context, *TxTracker) (*TxTracker, error, bool)); ok {
+	if rf, ok := ret.Get(0).(func(context.Context, *TxTracker) (*TxTracker, error)); ok {
 		return rf(ctx, txTracker)
 	}
 	if rf, ok := ret.Get(0).(func(context.Context, *TxTracker) *TxTracker); ok {
@@ -44,13 +43,7 @@ func (_m *WorkerMock) AddTxTracker(ctx context.Context, txTracker *TxTracker) (*
 		r1 = ret.Error(1)
 	}
 
-	if rf, ok := ret.Get(2).(func(context.Context, *TxTracker) bool); ok {
-		r2 = rf(ctx, txTracker)
-	} else {
-		r2 = ret.Get(2).(bool)
-	}
-
-	return r0, r1, r2
+	return r0, r1
 }
 
 // DeleteTx provides a mock function with given fields: txHash, from
diff --git a/sequencer/worker.go b/sequencer/worker.go
index fefecf99d6..cba6938f7c 100644
--- a/sequencer/worker.go
+++ b/sequencer/worker.go
@@ -45,7 +45,7 @@ func (w *Worker) NewTxTracker(tx types.Transaction, counters state.ZKCounters, i
 }
 
 // AddTxTracker adds a new Tx to the Worker
-func (w *Worker) AddTxTracker(ctx context.Context, tx *TxTracker) (replacedTx *TxTracker, dropReason error, isWIP bool) {
+func (w *Worker) AddTxTracker(ctx context.Context, tx *TxTracker) (replacedTx *TxTracker, dropReason error) {
 	w.workerMutex.Lock()
 	defer w.workerMutex.Unlock()
 
@@ -59,19 +59,19 @@ func (w *Worker) AddTxTracker(ctx context.Context, tx *TxTracker) (replacedTx *T
 		if err != nil {
 			dropReason = fmt.Errorf("AddTx GetLastStateRoot error: %v", err)
 			log.Error(dropReason)
-			return nil, dropReason, false
+			return nil, dropReason
 		}
 		nonce, err := w.state.GetNonceByStateRoot(ctx, tx.From, root)
 		if err != nil {
 			dropReason = fmt.Errorf("AddTx GetNonceByStateRoot error: %v", err)
 			log.Error(dropReason)
-			return nil, dropReason, false
+			return nil, dropReason
 		}
 		balance, err := w.state.GetBalanceByStateRoot(ctx, tx.From, root)
 		if err != nil {
 			dropReason = fmt.Errorf("AddTx GetBalanceByStateRoot error: %v", err)
 			log.Error(dropReason)
-			return nil, dropReason, false
+			return nil, dropReason
 		}
 
 		addr = newAddrQueue(tx.From, nonce.Uint64(), balance)
@@ -88,8 +88,8 @@ func (w *Worker) AddTxTracker(ctx context.Context, tx *TxTracker) (replacedTx *T
 	var newReadyTx, prevReadyTx, repTx *TxTracker
 	newReadyTx, prevReadyTx, repTx, dropReason = addr.addTx(tx)
 	if dropReason != nil {
-		log.Infof("AddTx tx(%s) dropped from addrQueue(%s)", tx.HashStr, tx.FromStr)
-		return repTx, dropReason, false
+		log.Infof("AddTx tx(%s) dropped from addrQueue(%s), reason: %s", tx.HashStr, tx.FromStr, dropReason.Error())
+		return repTx, dropReason
 	}
 
 	// Update the EfficiencyList (if needed)
@@ -106,7 +106,7 @@ func (w *Worker) AddTxTracker(ctx context.Context, tx *TxTracker) (replacedTx *T
 		log.Infof("AddTx replacedTx(%s) nonce(%d) cost(%s) has been replaced", repTx.HashStr, repTx.Nonce, repTx.Cost.String())
 	}
 
-	return repTx, nil, true
+	return repTx, nil
 }
 
 func (w *Worker) applyAddressUpdate(from common.Address, fromNonce *uint64, fromBalance *big.Int) (*TxTracker, *TxTracker, []*TxTracker) {
diff --git a/sequencer/worker_test.go b/sequencer/worker_test.go
index 38083fd803..51787f188c 100644
--- a/sequencer/worker_test.go
+++ b/sequencer/worker_test.go
@@ -61,7 +61,7 @@ func processWorkerAddTxTestCases(t *testing.T, worker *Worker, testCases []worke
 			tx.updateZKCounters(testCase.counters, worker.batchConstraints, worker.batchResourceWeights)
 			t.Logf("%s=%s", testCase.name, fmt.Sprintf("%.2f", tx.Efficiency))
 
-			_, err, _ := worker.AddTxTracker(ctx, &tx)
+			_, err := worker.AddTxTracker(ctx, &tx)
 			if err != nil {
 				return
 			}
diff --git a/synchronizer/mock_state.go b/synchronizer/mock_state.go
index 12ec0a0388..a90c4227c2 100644
--- a/synchronizer/mock_state.go
+++ b/synchronizer/mock_state.go
@@ -1,4 +1,4 @@
-// Code generated by mockery v2.28.1. DO NOT EDIT.
+// Code generated by mockery v2.22.1. DO NOT EDIT.
 
 package synchronizer