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Manchester United are reeling from a new blow - as Chris Smalling is ruled with a hamstring problem for up to a month.

The centre-half could be missing for three to four weeks just as David Moyes faces a crisis in his defence. The giant defender damaged his hamstring in training before the Liverpool thrashing - and now he should be out for the next few games.

Moyes will be able to cope against Olympiakos as Nemanja Vidic is available. But the Serbian is banned for the trip to West Ham and the derby with City.

So that means the Red Devils could be forced to recall ageing Rio Ferdinand to face his former club and then their title-chasing neighbours.

Ferdinand came in for the final minutes against Liverpool, but will now have to start beside Phil Jones in the Premier League rescue bid. The pair are the only senior centre-backs available for those matches as Jonny Evans is already ruled out.

Moyes let England under-21 cap Michael Keane go out on loan to Blackburn Rovers, but he is inexperienced at the top level.

United are dreading any further injuries as they try to save some face from a disastrous season - and hope Smalling returns as soon as possible.