"[Fellaini's injury] is a very big blow because he is an important player for us," admitted manager David Moyes.
"Phil is not as bad as we first thought but it may just come too quick for him - that is the way it is looking at this moment in time."
The new injuries come in the same week that youngster Ross Barkley, who has been on the bench for the last four games, broke a leg while playing for England Under-19s.
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