Despite backing Moyes to turn United around, Keane believes that Bayern are capable of brutally exposing their weaknesses in the Champions League quarter-finals.
"Forget about beating the West Hams, and the Olympiakoses and Crystal Palaces, that's not what playing for Manchester United is about," Keane said. "It's about doing it against the big teams.
"If they play against Bayern like they have in the last two weeks, then they will be in massive, massive trouble. "It's not a lack of effort. I've seen a few of United's games and they have lost a bit of confidence. They are human beings. It is not going to get any easier in the next couple of months and there is more pain to come with Bayern next Tuesday. In defence of David Moyes, he cannot believe how tough it's been."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball