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David Moyes has taken a major selection gamble ahead of tonight's Champions League quarter-final second leg against Bayern Munich.

Moyes has dropped Rio Ferdinand and decided to bring in Chris Smalling for tonight's decisive tie at the Allianz Arena, with a place in the semi-finals at stake.

Despite the former England man and long-time central defensive partner Nemanja Vidic combining well in the first leg at Old Trafford which finished 1-1, Moyes has decided to break up the established duo tonight.

The decision is a risky one as Smalling has only just returned from a month-long injury lay-off with a hamstring injury, making his comeback in United's 4-0 win at Newcastle on Saturday.

With Smalling in for Ferdinand and Rafael not having made the trip to Munich due to injury, Phil Jones is expected to play at right-back, with Patrice Evra in his customary role at left-back.

The big dilemma Moyes faces is whether to select attacking midfielder Shinji Kagawa from the start against Bayern, with Juan Mata cup-tied and Marouane Fellaini injured. Former Borussia Dortmund playmaker Kagawa has never lost against Bayern and was impressive in the first leg at Old Trafford when he came on at half-time for Ryan Giggs.

But Moyes may take a more cautious approach and select Giggs alongside Michael Carrick and Darren Fletcher in central midfield, to ensure United do not get overrun there, and try to hit Bayern on the break.

Wayne Rooney will lead the Red Devils' attack, despite suffering a chipped bone in his left foot, with Antonio Valencia and Danny Welbeck providing support from the wide positions.

Expected Man Utd line-up: De Gea; Jones, Smalling, Vidic, Evra; Carrick, Fletcher; Valencia, Kagawa, Welbeck; Rooney.