Arsenal boss Arsene Wenger has criticised Chelsea over their imminent sale of Juan Mata to Manchester United.

The deal could breathe life into the defending champions' season, a move which the Arsenal boss is struggling to understand.

Wenger, forgetting about his sale of Robin van Persie to United, said this morning: "I'm surprised Mata is allowed to go because he is a great player. And Chelsea are strengthening a direct opponent.

"It opens up transfer market, Chelsea don't play United again. They could have sold Mata two weeks ago."

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