Manchester United will be looking to add centre backs in the summer transfer window and one top target appears to be on the move. United fans witnessed a fine defensive performance on Saturday afternoon as Erik ten Hag’s side beat Manchester City 2-1 in the FA Cup final. Shutting down the likes of Bernardo Silva, Kevin De Bruyne, Phil Foden and Erling Haaland all at once is something few teams have managed. United did it though with Raphael Varane and Lisandro Martinez producing outstanding displays to keep City at bay. Both Martinez and Varane have suffered injury problems this season and wit…