Chelsea defender David Luiz is adamant Diego Costa is fully committed to the cause.

Speaking after Sunday's showdown with Hull - when Costa made a first-team return - Luiz slammed the transfer rumours.

Praising Costa, Luiz told SFR Sport: "That's his job, to score goals, and he works on that every day.

"He does his job very well. He's a great player who's in fantastic form right now.

"He's playing well, and I'm happy for him because sometimes people talk a lot without knowing anything, and he's had to go through that.

"But it's normal people talk about the best players in the world, Diego is one of them."

And Luiz suggested it had been business as usual at Chelsea's Cobham training ground in the wake of the apparent unrest.

He continued: "I don't know. Things were normal.

"Everyone has offers, everyone has things to talk about.

"He's happy, always wants to play football, that's what's important for me."