Former Manchester United striker Teddy Sheringham has urged Harry Maguire to salvage his career by leaving the club this summer. Maguire fell out of favour under manager Erik ten Hag last season, with the Dutchman quickly identifying him as the weak link in United’s defence. Raphael Varane and Lisandro Martinez established themselves as the first-choice partnership at the back, forcing Maguire to spend most of the campaign on the bench. The United captain failed to take advantage of the limited…