diff --git a/tools/gce_setup/cloud_prod_runner.sh b/tools/gce_setup/cloud_prod_runner.sh
index 3760ae49795..520dfcd998a 100755
--- a/tools/gce_setup/cloud_prod_runner.sh
+++ b/tools/gce_setup/cloud_prod_runner.sh
@@ -34,7 +34,7 @@ main() {
   # temporarily remove ping_pong and cancel_after_first_response while investigating timeout
   test_cases=(large_unary empty_unary client_streaming server_streaming cancel_after_begin)
   auth_test_cases=(service_account_creds compute_engine_creds)
-  clients=(cxx java go ruby node)
+  clients=(cxx java go ruby node csharp_mono)
   for test_case in "${test_cases[@]}"
   do
     for client in "${clients[@]}"
diff --git a/tools/gce_setup/interop_test_runner.sh b/tools/gce_setup/interop_test_runner.sh
index 5f8c0e70645..ebc631c1fd5 100755
--- a/tools/gce_setup/interop_test_runner.sh
+++ b/tools/gce_setup/interop_test_runner.sh
@@ -35,8 +35,9 @@ echo $result_file_name
 
 main() {
   source grpc_docker.sh
-  test_cases=(large_unary empty_unary ping_pong client_streaming server_streaming cancel_after_begin cancel_after_first_response)
-  clients=(cxx java go ruby node)
+  # temporarily remove ping_pong and cancel_after_first_response while investigating timeout
+  test_cases=(large_unary empty_unary client_streaming server_streaming cancel_after_begin)
+  clients=(cxx java go ruby node csharp_mono)
   servers=(cxx java go ruby node python)
   for test_case in "${test_cases[@]}"
   do