The mid-season transfer window is often a source of complaint for managers, and Arsene Wenger is no different.
Speaking in his morning press conference, the Arsenal boss used Juan Mata's imminent transfer from Manchester United to Chelsea as evidence to support his opinions.
He believes Chelsea are open to letting Mata go partly because they have played United twice already, most recently last weekend, and the Red Devils still have to play a number of the club's rivals - including Arsenal next month.
He told Arsenal.com: "They could have sold him last week but it opens at least the opportunity [to question] the dates of this transfer window. Some teams have already played twice against one opponent and some others not. I think if you want to respect the fairness for everybody exactly the same, that should not happen.
"I just think you would want that everybody is on the same level. Chelsea do not make the rules but maybe the rules should be a bit more adapted to more fairness."
Wenger added that Mata is a 'great player' and still believes United are a 'direct opponent' to Chelsea.
United sit in seventh and have a real fight just to land fourth place. Arsenal are in the midst of a three-way fight for the Premier League title with Manchester City and Chelsea.
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