diff --git a/tools/internal_ci/linux/grpc_master_sanitizers.sh b/tools/internal_ci/linux/grpc_master_sanitizers.sh
index b174c9b1749..2cd0efe1588 100644
--- a/tools/internal_ci/linux/grpc_master_sanitizers.sh
+++ b/tools/internal_ci/linux/grpc_master_sanitizers.sh
@@ -37,12 +37,4 @@ git submodule update --init
 
 # download docker images from dockerhub
 export DOCKERHUB_ORGANIZATION=grpctesting
-tools/jenkins/run_jenkins_matrix.sh -f sanitizers linux
-
-# kill port_server.py to prevent the build from hanging
-ps aux | grep port_server\\.py | awk '{print $2}' | xargs kill -9
-
-if [ "$FAILED" != "" ]
-then
-  exit 1
-fi
+tools/run_tests/run_tests_matrix.sh -f sanitizers linux
diff --git a/tools/internal_ci/linux/grpc_portability.sh b/tools/internal_ci/linux/grpc_portability.sh
index a7460e5a50b..c7ac3bbcbee 100644
--- a/tools/internal_ci/linux/grpc_portability.sh
+++ b/tools/internal_ci/linux/grpc_portability.sh
@@ -37,13 +37,4 @@ git submodule update --init
 
 # download docker images from dockerhub
 export DOCKERHUB_ORGANIZATION=grpctesting
-tools/jenkins/run_jenkins_matrix.sh -f portability linux
-
-# kill port_server.py to prevent the build from hanging
-ps aux | grep port_server\\.py | awk '{print $2}' | xargs kill -9
-
-if [ "$FAILED" != "" ]
-then
-  exit 1
-fi
-
+tools/run_tests/run_tests_matrix.sh -f portability linux
diff --git a/tools/internal_ci/linux/grpc_portability_build_only.sh b/tools/internal_ci/linux/grpc_portability_build_only.sh
index 92678c15f80..edd6f916872 100644
--- a/tools/internal_ci/linux/grpc_portability_build_only.sh
+++ b/tools/internal_ci/linux/grpc_portability_build_only.sh
@@ -37,4 +37,4 @@ git submodule update --init
 
 # download docker images from dockerhub
 export DOCKERHUB_ORGANIZATION=grpctesting
-tools/jenkins/run_jenkins_matrix.sh -f portability linux --build_only
+tools/run_tests/run_tests_matrix.sh -f portability linux --build_only