Ole Gunnar Solskjaer’s side looked well on course for qualification from Group H after they collected nine points from their first four fixtures, but defeat in Germany last night condemned them to a return to the Europa League.
United have launched numerous salvage operations already this season but, despite a late rally, they fell short last night and were left to count the cost of a shambolic start to the game when they conceded twice in the opening 13 minutes.
‘We’ve got to go home, look at ourselves because it’s not good enough for this club to go out in a group in the Champions League,’ Maguire said afterwards.
‘We’re disappointed. Of course it’s frustrating (conceding early goals). As a defender you want to be keeping clean sheets and we seem to be shooting ourselves in the foot in the first five minutes of the game.
‘It’s a poor goal to give away. We’ve come here, we’ve known a (draw) is good enough to get through to the knockout stage and we concede after two minutes. It’s not acceptable. We’ve got to look at ourselves.
‘Although we do have great belief that we can get back into the game, one time we won’t manage to do so and unfortunately it’s been (on Tuesday night) because we can’t start a game like we have done.
‘We started the game really poor, especially when we’re coming away from home at a team that has got a great record at home and we give them a goal after two minutes.
United face local rivals Manchester City on Saturday at Old Trafford and Maguire hopes the prospect of a derby victory will be enough to motivate his team-mates who were demoralised following last night’s demise.
‘It’s the perfect game to have,’ Maguire told MUTV. ‘I haven’t thought about it as I’m digesting this. All the boys are all so disappointed but I’ve got to pick them up, the gaffer has got to pick them up.
‘It’s a massive game and there’s no better feeling than winning the Manchester derby at Old Trafford.’