diff --git a/spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/MessageRoutingCallback.java b/spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/MessageRoutingCallback.java
index 75aa71bb0..137d2b859 100644
--- a/spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/MessageRoutingCallback.java
+++ b/spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/MessageRoutingCallback.java
@@ -16,8 +16,6 @@
 
 package org.springframework.cloud.function.context;
 
-import org.reactivestreams.Publisher;
-
 import org.springframework.messaging.Message;
 
 /**
@@ -27,13 +25,5 @@ import org.springframework.messaging.Message;
  */
 public interface MessageRoutingCallback {
 
-	default String route(Message<?> message, FunctionProperties functionProperties) {
-		// noop
-		return null;
-	}
-
-	default String route(Publisher<?> publisher, FunctionProperties functionProperties) {
-		//noop
-		return null;
-	}
+	String route(Message<?> message, FunctionProperties functionProperties);
 }
diff --git a/spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/config/RoutingFunction.java b/spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/config/RoutingFunction.java
index 319d89c42..d98929f1b 100644
--- a/spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/config/RoutingFunction.java
+++ b/spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/config/RoutingFunction.java
@@ -179,12 +179,6 @@ public class RoutingFunction implements Function<Object, Object> {
 				return this.functionFromDefinition(functionDefinition);
 			}
 		}
-		else {
-			String functionDefinition = this.routingCallback.route((Publisher<?>) input, this.functionProperties);
-			if (StringUtils.hasText(functionDefinition)) {
-				return this.functionFromDefinition(functionDefinition);
-			}
-		}
 		return null;
 	}