"Wenger complaining is normal, because he always does. It's something that we know," said the Chelsea boss.
"When a player plays for a club on August 20 and two weeks later on September 5 plays against the same club with a different shirt, this is normal, because this is the market.
"We don't do the market, we don't do the rules, we have just to do according to the rules.
"If Wenger sells [Mesut] Ozil to Man United in this moment I would be very happy because he sells a very important player.
"When he says this is not fair, I think what is not fair is that his team always has the best days to play."
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