diff --git a/src/Grant/GoogleSso.php b/src/Grant/GoogleSso.php
new file mode 100644
index 0000000..ab05926
--- /dev/null
+++ b/src/Grant/GoogleSso.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace GetPhoto\Oauth2\Client\Grant;
+
+/**
+ *  Impersonate grant
+ *  Grant for trusted client to impersonate user
+ *
+ * @author navihtot ivan.toth@fotograf.de
+ */
+class GoogleSso extends \League\OAuth2\Client\Grant\AbstractGrant {
+	/**
+	 * @inheritdoc
+	 */
+	protected function getName() {
+		return 'google_sso';
+	}
+
+	/**
+	 * @inheritdoc
+	 */
+	protected function getRequiredRequestParameters() {
+		return [
+			'id_token',
+		];
+	}
+}
diff --git a/src/Provider/OauthProvider.php b/src/Provider/OauthProvider.php
index e65c373..3494c7f 100644
--- a/src/Provider/OauthProvider.php
+++ b/src/Provider/OauthProvider.php
@@ -2,6 +2,7 @@
 
 namespace GetPhoto\Oauth2\Client\Provider;
 
+use GetPhoto\Oauth2\Client\Grant\GoogleSso;
 use League\OAuth2\Client\Provider\AbstractProvider;
 use InvalidArgumentException;
 use League\OAuth2\Client\Provider\Exception\IdentityProviderException;
@@ -79,6 +80,9 @@ public function __construct(array $options = [], array $collaborators = []) {
 		//impersonate grant
 		$this->grantFactory->setGrant('impersonate', new Impersonate);
 
+		//google sso grant
+		$this->grantFactory->setGrant('google_sso', new GoogleSso);
+
 		//setting logger
 		if (empty($collaborators['logger'])) {
 			$collaborators['logger'] = new Logger();