diff --git a/aws_lambda_powertools/utilities/data_classes/api_gateway_authorizer_event.py b/aws_lambda_powertools/utilities/data_classes/api_gateway_authorizer_event.py
index 6d05984128e..bcf035b61c0 100644
--- a/aws_lambda_powertools/utilities/data_classes/api_gateway_authorizer_event.py
+++ b/aws_lambda_powertools/utilities/data_classes/api_gateway_authorizer_event.py
@@ -520,8 +520,11 @@ def _add_route(self, effect: str, http_method: str, resource: str, conditions: l
         """Adds a route to the internal lists of allowed or denied routes. Each object in
         the internal list contains a resource ARN and a condition statement. The condition
         statement can be null."""
-        if http_method != "*" and http_method not in HttpVerb.__members__:
-            allowed_values = [verb.value for verb in HttpVerb]
+        allowed_values = [verb.value for verb in HttpVerb]
+        if http_method in HttpVerb.__members__:
+            http_method = HttpVerb[http_method].value
+
+        if http_method not in allowed_values:
             raise ValueError(f"Invalid HTTP verb: '{http_method}'. Use either '{allowed_values}'")
 
         if not self._resource_pattern.match(resource):
diff --git a/tests/unit/data_classes/required_dependencies/test_api_gateway_authorizer.py b/tests/unit/data_classes/required_dependencies/test_api_gateway_authorizer.py
index c26c1a417e7..cb2dc718036 100644
--- a/tests/unit/data_classes/required_dependencies/test_api_gateway_authorizer.py
+++ b/tests/unit/data_classes/required_dependencies/test_api_gateway_authorizer.py
@@ -130,6 +130,24 @@ def test_authorizer_response_deny_route(builder: APIGatewayAuthorizerResponse):
     }
 
 
+def test_authorizer_response_deny_route_all_methods(builder: APIGatewayAuthorizerResponse):
+    builder.allow_all_routes()
+    builder.deny_route(http_method="ALL", resource="/admin/*")
+
+    assert builder.asdict()["policyDocument"]["Statement"] == [
+        {
+            "Action": "execute-api:Invoke",
+            "Effect": "Allow",
+            "Resource": ["arn:aws:execute-api:us-west-1:123456789:fantom/dev/*/*"],
+        },
+        {
+            "Action": "execute-api:Invoke",
+            "Effect": "Deny",
+            "Resource": ["arn:aws:execute-api:us-west-1:123456789:fantom/dev/*/admin/*"],
+        },
+    ]
+
+
 def test_authorizer_response_allow_route_with_conditions(builder: APIGatewayAuthorizerResponse):
     condition = {"StringEquals": {"method.request.header.Content-Type": "text/html"}}
     builder.allow_route(