Erik ten Hag lauded the partnership of Raphael Varane and Lisandro Martinez after Manchester United's final friendly with Rayo Vallecano.
United ended their pre-season schedule with a 1-1 draw against Vallecano at Old Trafford as £55million signing Martinez lined up for the first time since his arrival from Ajax.
Martinez was partnered by Raphael Varane, who captained United, and the 24-year-old played for an hour before he was replaced by Eric Bailly.