Former Premier League striker Clinton Morrison says Manchester United have "problems at the back" after twice letting a lead slip to draw 2-2 at Everton on Sunday. Ainsley Maitland-Niles' stoppage-time equaliser was the sixth goal Michael Carrick's side have conceded in the three games so far. This is the first campaign in five years where United have let in at least two goals in each of their first three league matches.