Mata is due to make his United debut against Cardiff City and could be accompanied by fit-again strikers Rooney and Van Persie.
"It's a big night for Manchester United supporters," the boss told reporters. "Robin and Wayne have both trained today. We are hoping at some time to get them available for the game.
"We will make a decision on Juan Mata, while Ole Gunnar Solskjaer is returning to Old Trafford as a manager of the opposition. He will get a great reception - and deserves it."
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