Robson sees West Brom clash as critical for Man Utd
He maintains though that David Moyes will prevail like his prodigious predecessor and sees United's game against former club West Bromwich Albion on Saturday as pivotal.
"We can't afford to slip up," the former United captain told the Daily Mail. "Any United player should and will be hurting from losing to City and Liverpool but they have to recover or be left behind. We made it too easy for City and have to learn from that.
"We are talking about being five games in here and David is still finding out about the qualities of certain players. People forget the side that won the title last season lost to Everton first game and to Tottenham easily at home, it was 3-2 and that flattered United. But United recovered. This team needs to keep it's feet on the ground, work for each other and look forward.