Manchester United will be in the hunt for a centre back or two this summer with big changes expected at the back – no matter who is in the Old Trafford dugout. Erik ten Hag continues to fight for his United job but performances continue to be a concern. United were hardly convincing against Coventry City, Sheffield United and Burnley – three teams expected to be in the Championship together next season – over the last 10 days or so. United didn’t lose any of those games but Ten Hag still manages to be under pressure with performances falling short of the mark. Ineos will be weighing up whether…