Index: src/wp-includes/ms-load.php
===================================================================
--- src/wp-includes/ms-load.php	(revision 25508)
+++ src/wp-includes/ms-load.php	(working copy)
@@ -82,6 +82,15 @@
 	if ( is_super_admin() )
 		return true;
 
+	/**
+	 * Fires before site status is checked.
+	 *
+	 * @since 3.7.0
+	 *
+	 * @param object $blog Contains details for a single site. @see get_blog_details()
+	 */
+	do_action( 'ms_site_check_status', $blog );
+
 	if ( '1' == $blog->deleted ) {
 		if ( file_exists( WP_CONTENT_DIR . '/blog-deleted.php' ) )
 			return WP_CONTENT_DIR . '/blog-deleted.php';