diff --git a/cluster/gce/container-linux/configure-helper.sh b/cluster/gce/container-linux/configure-helper.sh
index c5e15369cb3..ac54e662f3f 100755
--- a/cluster/gce/container-linux/configure-helper.sh
+++ b/cluster/gce/container-linux/configure-helper.sh
@@ -1241,6 +1241,13 @@ function start-kube-addons {
 
   # Set up manifests of other addons.
   if [[ "${KUBE_PROXY_DAEMONSET:-}" == "true" ]]; then
+    if [ -n "${CUSTOM_KUBE_PROXY_YAML:-}" ]; then
+      # Replace with custom GKE kube proxy.
+      cat > "$src_dir/kube-proxy/kube-proxy-ds.yaml" <<EOF
+$(echo "$CUSTOM_KUBE_PROXY_YAML")
+EOF
+      update-prometheus-to-sd-parameters "$src_dir/kube-proxy/kube-proxy-ds.yaml"
+    fi
     prepare-kube-proxy-manifest-variables "$src_dir/kube-proxy/kube-proxy-ds.yaml"
     setup-addon-manifests "addons" "kube-proxy"
   fi
diff --git a/cluster/gce/gci/configure-helper.sh b/cluster/gce/gci/configure-helper.sh
index 251debda44c..ff69a0899af 100644
--- a/cluster/gce/gci/configure-helper.sh
+++ b/cluster/gce/gci/configure-helper.sh
@@ -1776,6 +1776,13 @@ function start-kube-addons {
 
   # Set up manifests of other addons.
   if [[ "${KUBE_PROXY_DAEMONSET:-}" == "true" ]]; then
+    if [ -n "${CUSTOM_KUBE_PROXY_YAML:-}" ]; then
+      # Replace with custom GKE kube proxy.
+      cat > "$src_dir/kube-proxy/kube-proxy-ds.yaml" <<EOF
+$(echo "$CUSTOM_KUBE_PROXY_YAML")
+EOF
+      update-prometheus-to-sd-parameters "$src_dir/kube-proxy/kube-proxy-ds.yaml"
+    fi
     prepare-kube-proxy-manifest-variables "$src_dir/kube-proxy/kube-proxy-ds.yaml"
     setup-addon-manifests "addons" "kube-proxy"
   fi