Diego Costa has suffered a groin injury and is now a major doubt for the United game[GETTY]
Costa, who has scored nine goals in his first nine games, has been struggling with a hamstring injury all season - but now the striker has picked up a groin injury on top of his other worries.
He has been having intensive treatment this week but Mourinho said after the 6-0 Champions League win over Maribor that he had no chance for the game against Manchester United at Old Trafford on Sunday - and this appears to confirm that.
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