Diego Costa is reportedly close to joining Arsenal as a free agent, but William Gallas has opposed such a deal.
The Brazilian-Spanish striker is linked with a move to The Gunners, after ending his contract with Atletico Madrid.
But Gallas has said he can cause a lot of problems with his temperament and moreover is not manageable.
“There is no denying that a different mentality can fall on the team. “He just wants to win matches,” Gallas told PlayOJO.
“If his teammates do not play well, then he will shout in the match and that is probably good for the players.”
“Costa is linked with a move to Arsenal and he could cause a lot of problems there, especially for defenders, while Alexandre Lacazette would have to sit on the bench again,” added the Arsenal legend.
Costa was even before in the Premier League, where he had played with Chelsea and had shown extremely high form. /Telegraph/