Manchester United fear Marouane Fellaini will be missing for seven weeks due to his wrist injury.
The Daily Mail says Fellani could face surgery to solve a wrist injury and could be out until December.
The £27.5million summer signing missed Saturday's 2-1 Barclays Premier League victory over Sunderland and visited a specialist in Manchester before being assessed by medics in Belgium.
He will miss his national side's forthcoming World Cup qualifiers against Croatia and Wales, and up to two months of Man United matches in the league, Capital One Cup and Champions League.
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