Alan Shearer believes Erik ten Hag will be heading out the door at Manchester United at the end of the season. Manchester United booked their place in the FA Cup final with a penalty shootout win over Coventry City on Sunday. But the victory raised more doubts over Ten Hag’s future after a stunning second-half collapse. Indeed, United looked to be cruising to a comfortable 3-0 victory after goals from Scott McTominay, Harry Maguire and Bruno Fernandes. Coventry had other ideas though and United avoided what would have gone down as one of the greatest comebacks in FA Cup history. The Sky Blues …