Costa was involved in an altercation that led to Gunners' defender Gabriel being sent off and, after the match, Zouma said Costa was a player who liked to “cheat a lot” and “put the opponents out of the game”
However, the French defender has since said he did not mean for his comments to come across as they did.
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Zouma also believes his comments were taken out of context due to English not being his first language.
As per the BBC, the former AS Saint-Etienne man said: "Sorry for any confusion. English is not my first language. I did not mean to accuse anyone of cheating."
A Chelsea spokesperson also commented on the remarks, saying: "It's harsh to take literally the words of a young player spoken in his second language immediately after a game,
"He is deeply upset his words have been used to attack a teammate and friend."
WHY WOULD HE?
Some of Costa's actions at Stamford Bridge were questionable, but it seems highly unlikely one of his teammates would attack him.
In the same interview, the France international labelled the forward a 'nice guy' and someone Chelse were 'proud' of.
The Spain international plays on the edge and does all he can to rile up opponents, and that appears to be what the 20-year-old was getting at.
Despite not getting on the scoresheet, the 26-year-old was one of Chelsea's most impressive players on a day that could signify the revival of their season.