diff --git a/crates/blockifier/bench/blockifier_bench.rs b/crates/blockifier/bench/blockifier_bench.rs
index 8d172e2da7..c2b35316d1 100644
--- a/crates/blockifier/bench/blockifier_bench.rs
+++ b/crates/blockifier/bench/blockifier_bench.rs
@@ -11,8 +11,7 @@ use blockifier::test_utils::transfers_generator::TransfersGenerator;
 use criterion::{criterion_group, criterion_main, Criterion};
 
 pub fn transfers_benchmark(c: &mut Criterion) {
-    let concurrency_mode = false;
-    let mut transfers_generator = TransfersGenerator::new(concurrency_mode);
+    let mut transfers_generator = TransfersGenerator::new();
     // Create a benchmark group called "transfers", which iterates over the accounts round-robin
     // and performs transfers.
     c.bench_function("transfers", |benchmark| {
diff --git a/crates/blockifier/src/blockifier/config.rs b/crates/blockifier/src/blockifier/config.rs
index ff4fd33993..c77b3495c3 100644
--- a/crates/blockifier/src/blockifier/config.rs
+++ b/crates/blockifier/src/blockifier/config.rs
@@ -2,18 +2,28 @@
 pub struct TransactionExecutorConfig {
     pub concurrency_config: ConcurrencyConfig,
 }
+impl TransactionExecutorConfig {
+    pub fn create_for_testing() -> Self {
+        Self { concurrency_config: ConcurrencyConfig::create_for_testing() }
+    }
+}
 
-#[derive(Debug, Clone)]
-#[cfg_attr(not(feature = "concurrency"), derive(Default))]
+#[derive(Debug, Default, Clone)]
 pub struct ConcurrencyConfig {
     pub enabled: bool,
     pub n_workers: usize,
     pub chunk_size: usize,
 }
+#[cfg(all(feature = "testing", not(feature = "concurrency")))]
+impl ConcurrencyConfig {
+    pub fn create_for_testing() -> Self {
+        Self { enabled: false, n_workers: 0, chunk_size: 0 }
+    }
+}
 
-#[cfg(feature = "concurrency")]
-impl Default for ConcurrencyConfig {
-    fn default() -> Self {
+#[cfg(all(feature = "testing", feature = "concurrency"))]
+impl ConcurrencyConfig {
+    pub fn create_for_testing() -> Self {
         Self { enabled: true, n_workers: 4, chunk_size: 64 }
     }
 }
diff --git a/crates/blockifier/src/blockifier/transaction_executor.rs b/crates/blockifier/src/blockifier/transaction_executor.rs
index 04188852c9..5bda50d089 100644
--- a/crates/blockifier/src/blockifier/transaction_executor.rs
+++ b/crates/blockifier/src/blockifier/transaction_executor.rs
@@ -64,6 +64,10 @@ impl<S: StateReader> TransactionExecutor<S> {
         config: TransactionExecutorConfig,
     ) -> Self {
         log::debug!("Initializing Transaction Executor...");
+        assert_eq!(
+            block_context.concurrency_mode, config.concurrency_config.enabled,
+            "The concurrency mode must be identical in the block context and in the config."
+        );
         let bouncer_config = block_context.bouncer_config.clone();
         // Note: the state might not be empty even at this point; it is the creator's
         // responsibility to tune the bouncer according to pre and post block process.
@@ -85,6 +89,10 @@ impl<S: StateReader> TransactionExecutor<S> {
         &mut self,
         tx: &Transaction,
     ) -> TransactionExecutorResult<TransactionExecutionInfo> {
+        assert!(
+            !self.block_context.concurrency_mode,
+            "Executing a single transaction cannot be done in a concurrent mode."
+        );
         let mut transactional_state = TransactionalState::create_transactional(
             self.block_state.as_mut().expect(BLOCK_STATE_ACCESS_ERR),
         );
@@ -117,6 +125,10 @@ impl<S: StateReader> TransactionExecutor<S> {
         &mut self,
         txs: &[Transaction],
     ) -> Vec<TransactionExecutorResult<TransactionExecutionInfo>> {
+        assert!(
+            !self.block_context.concurrency_mode,
+            "Executing transactions sequentially cannot be done in a concurrent mode."
+        );
         let mut results = Vec::new();
         for tx in txs {
             match self.execute(tx) {
diff --git a/crates/blockifier/src/blockifier/transaction_executor_test.rs b/crates/blockifier/src/blockifier/transaction_executor_test.rs
index 34d0e5c5d0..507b84cf8b 100644
--- a/crates/blockifier/src/blockifier/transaction_executor_test.rs
+++ b/crates/blockifier/src/blockifier/transaction_executor_test.rs
@@ -241,7 +241,7 @@ fn test_l1_handler(block_context: BlockContext) {
 
 fn test_bouncing(#[case] initial_bouncer_weights: BouncerWeights, #[case] n_events: usize) {
     let max_n_events_in_block = 10;
-    let block_context = BlockContext::create_for_bouncer_testing(max_n_events_in_block);
+    let block_context = BlockContext::create_for_bouncer_testing(max_n_events_in_block, false);
 
     let TestInitData { state, account_address, contract_address, mut nonce_manager } =
         create_test_init_data(&block_context.chain_info, CairoVersion::Cairo1);
@@ -265,14 +265,17 @@ fn test_bouncing(#[case] initial_bouncer_weights: BouncerWeights, #[case] n_even
 
 #[rstest]
 fn test_execute_txs_bouncing() {
+    let config = TransactionExecutorConfig::create_for_testing();
     let max_n_events_in_block = 10;
-    let block_context = BlockContext::create_for_bouncer_testing(max_n_events_in_block);
+    let block_context = BlockContext::create_for_bouncer_testing(
+        max_n_events_in_block,
+        config.concurrency_config.enabled,
+    );
 
     let TestInitData { state, account_address, contract_address, .. } =
         create_test_init_data(&block_context.chain_info, CairoVersion::Cairo1);
 
-    let mut tx_executor =
-        TransactionExecutor::new(state, block_context, TransactionExecutorConfig::default());
+    let mut tx_executor = TransactionExecutor::new(state, block_context, config);
 
     let txs: Vec<Transaction> = [
         emit_n_events_tx(1, account_address, contract_address, nonce!(0_u32)),
diff --git a/crates/blockifier/src/blockifier/transfers_flow_test.rs b/crates/blockifier/src/blockifier/transfers_flow_test.rs
index 647fd7da88..894ec3e465 100644
--- a/crates/blockifier/src/blockifier/transfers_flow_test.rs
+++ b/crates/blockifier/src/blockifier/transfers_flow_test.rs
@@ -2,7 +2,6 @@ use crate::test_utils::transfers_generator::TransfersGenerator;
 
 #[test]
 pub fn transfers_flow_test() {
-    let concurrency_mode = true;
-    let mut transfers_generator = TransfersGenerator::new(concurrency_mode);
+    let mut transfers_generator = TransfersGenerator::new();
     transfers_generator.execute_chunk_of_transfers();
 }
diff --git a/crates/blockifier/src/test_utils/struct_impls.rs b/crates/blockifier/src/test_utils/struct_impls.rs
index 07244b1fd2..485230b14e 100644
--- a/crates/blockifier/src/test_utils/struct_impls.rs
+++ b/crates/blockifier/src/test_utils/struct_impls.rs
@@ -175,7 +175,10 @@ impl BlockContext {
         }
     }
 
-    pub fn create_for_bouncer_testing(max_n_events_in_block: usize) -> Self {
+    pub fn create_for_bouncer_testing(
+        max_n_events_in_block: usize,
+        concurrency_mode: bool,
+    ) -> Self {
         Self {
             bouncer_config: BouncerConfig {
                 block_max_capacity: BouncerWeights {
@@ -184,7 +187,7 @@ impl BlockContext {
                 },
                 ..BouncerConfig::empty()
             },
-            ..Self::create_for_testing()
+            ..Self::create_for_account_testing_with_concurrency_mode(concurrency_mode)
         }
     }
 
diff --git a/crates/blockifier/src/test_utils/transfers_generator.rs b/crates/blockifier/src/test_utils/transfers_generator.rs
index 7c0d44b5ee..400719886e 100644
--- a/crates/blockifier/src/test_utils/transfers_generator.rs
+++ b/crates/blockifier/src/test_utils/transfers_generator.rs
@@ -33,14 +33,14 @@ pub struct TransfersGenerator {
 }
 
 impl TransfersGenerator {
-    pub fn new(concurrency_mode: bool) -> Self {
+    pub fn new() -> Self {
         let account_contract = FeatureContract::AccountWithoutValidations(CairoVersion::Cairo0);
-        let block_context =
-            BlockContext::create_for_account_testing_with_concurrency_mode(concurrency_mode);
+        let executor_config = TransactionExecutorConfig::create_for_testing();
+        let block_context = BlockContext::create_for_account_testing_with_concurrency_mode(
+            executor_config.concurrency_config.enabled,
+        );
         let chain_info = block_context.chain_info().clone();
         let state = test_state(&chain_info, BALANCE * 1000, &[(account_contract, N_ACCOUNTS)]);
-        // TODO(Avi, 20/05/2024): Enable concurrency.
-        let executor_config = TransactionExecutorConfig::default();
         let executor = TransactionExecutor::new(state, block_context, executor_config);
         let account_addresses = (0..N_ACCOUNTS)
             .map(|instance_id| account_contract.get_instance_address(instance_id))
@@ -115,3 +115,9 @@ impl TransfersGenerator {
         AccountTransaction::Invoke(tx)
     }
 }
+
+impl Default for TransfersGenerator {
+    fn default() -> Self {
+        Self::new()
+    }
+}
diff --git a/crates/native_blockifier/src/py_block_executor.rs b/crates/native_blockifier/src/py_block_executor.rs
index 69ffa0557b..13096b37d8 100644
--- a/crates/native_blockifier/src/py_block_executor.rs
+++ b/crates/native_blockifier/src/py_block_executor.rs
@@ -168,13 +168,13 @@ impl PyBlockExecutor {
     ) -> NativeBlockifierResult<Py<PyBytes>> {
         let tx: Transaction = py_tx(tx, optional_py_class_info).expect(PY_TX_PARSING_ERR);
         let tx_execution_info = self.tx_executor().execute(&tx)?;
-        let typed_tx_execution_info = ThinTransactionExecutionInfo::from_tx_execution_info(
+        let thin_tx_execution_info = ThinTransactionExecutionInfo::from_tx_execution_info(
             &self.tx_executor().block_context,
             tx_execution_info,
         );
 
         // Serialize and convert to PyBytes.
-        let serialized_tx_execution_info = typed_tx_execution_info.serialize();
+        let serialized_tx_execution_info = thin_tx_execution_info.serialize();
         Ok(Python::with_gil(|py| PyBytes::new(py, &serialized_tx_execution_info).into()))
     }
 
@@ -390,7 +390,7 @@ impl PyBlockExecutor {
         use blockifier::state::global_cache::GLOBAL_CONTRACT_CACHE_SIZE_FOR_TEST;
         Self {
             bouncer_config: BouncerConfig::max(),
-            tx_executor_config: TransactionExecutorConfig::default(),
+            tx_executor_config: TransactionExecutorConfig::create_for_testing(),
             storage: Box::new(storage),
             chain_info: ChainInfo::default(),
             versioned_constants: VersionedConstants::latest_constants().clone(),