The Frenchman is concerned that the Spain playmaker will be able to play against Chelsea's title rivals when he joins Manchester United, but not against the BluesJose Mourinho has hit back at Arsene Wenger after the Arsenal manager complained that Juan Mata's impending transfer to Manchester United is "unfair".
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But Mourinho is not concerned: "Wenger complaining is normal because he always does. It's something we know," he told reporters.
"If Wenger sold [Mesut] Ozil to Man United I would be very happy because they lose a good player, but Wenger will complain and say it's not fair.
"When he says this is not fair I think what's not fair is his team always has the best days to play.
"When you go to the fixtures during the season, it's never fair because [Arsenal] always get the right times to play, to rest."
Mata is expected to travel by helicopter to Manchester United's Carrington training ground on Friday to complete his club record £37 million move.
He had been scheduled to wrap up the deal on Thursday, but Chelsea's negotiations for Mohamed Salah, and poor weather conditions, delayed proceedings.