diff --git a/api/src/main/java/io/grpc/LoadBalancer.java b/api/src/main/java/io/grpc/LoadBalancer.java
index 247f0901560..5b30f9f74b8 100644
--- a/api/src/main/java/io/grpc/LoadBalancer.java
+++ b/api/src/main/java/io/grpc/LoadBalancer.java
@@ -893,7 +893,6 @@ public ChannelLogger getChannelLogger() {
    *
    * @since 1.2.0
    */
-  @ThreadSafe
   @ExperimentalApi("https://github.com/grpc/grpc-java/issues/1771")
   public abstract static class Subchannel {
     /**
@@ -911,8 +910,7 @@ public abstract static class Subchannel {
     /**
      * Asks the Subchannel to create a connection (aka transport), if there isn't an active one.
      *
-     * <p>It should be called from the Synchronization Context.  Currently will log a warning if
-     * violated.  It will become an exception eventually.  See <a
+     * <p>It should be called from the Synchronization Context.  See <a
      * href="https://github.com/grpc/grpc-java/issues/5015">#5015</a> for the background.
      *
      * @since 1.2.0
diff --git a/core/src/main/java/io/grpc/internal/ManagedChannelImpl.java b/core/src/main/java/io/grpc/internal/ManagedChannelImpl.java
index 58e8808292b..9f644192d0d 100644
--- a/core/src/main/java/io/grpc/internal/ManagedChannelImpl.java
+++ b/core/src/main/java/io/grpc/internal/ManagedChannelImpl.java
@@ -1505,7 +1505,6 @@ public void run() {
 
     @Override
     public void requestConnection() {
-      logWarningIfNotInSyncContext("Subchannel.requestConnection()");
       subchannel.obtainActiveTransport();
     }