Chelsea legend Gianfranco Zola has taken aim at Diego Costa over the past week's controversy.

The Spaniard was dropped for last week's victory over Leicester, having received a huge offer from Chinese Super League club Tianjin Quanjian.

Zola, who is currently in charge of Birmingham City, believes manager Antonio Conte has a difficult choice to make in regards to Costa's future but is adamant no player is bigger than the club itself.

"The club and manager have a hard decision there," Zola told TalkSPORT.

"We are talking about a strong and inspirational player. I don't know what the margins are to find an agreement.

"Obviously, I would try and find an agreement. But one thing is for sure, the club is always above everyone.

"It depends on what the manager and the club wants to do, but the club always has to be on top of everybody."