Erik ten Hag has a Manchester United star who could still add invaluable “experience” to his Red Devils first-team squad at Old Trafford this season. That is according to Manchester United legend Nicky Butt, who has admitted that he finds it “difficult” to “have a pop” at one player in Erik ten Hag’s squad. United have had an underwhelming start to the new Premier League season under Ten Hag, who signed a new contract extension with the Red Devils this summer. The Red Devils kicked off their Premier League campaign last month with a 1-0 win over Fulham at Old Trafford, with Joshua Zirkzee scor…