United are not their customary dangerous selves this campaign, having fallen to seventh on the domestic standings, but Bayern midfielder Schweinsteiger is not about to discount David Moyes' men in a Champions League fixture.
"Everyone knows what to expect tomorrow," he told reporters in a press conference. "It will be an incredibly difficult game.
"It's something very special to be able to play at Old Trafford.
"United should be one of the top four in the league all the time."
He added: "It's great to have already one title, but we can't lose focus now. We want to win every remaining game. We're a team that wants to win every game - even in training. This is no different."
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