Chelsea target Diego Costa insists he's happy at Atletico Madrid.

Diego Costa admitted he didn't understand Chelsea fans serenading him at last week's Champions League semi-final first leg.

The striker is No 1 on the Blues most-wanted list this summer, but insisted he is happy at the La Liga leaders.

"The truth is that I didn't understand anything. I heard my name and asked what they were saying," he told the London Evening Standard.

"I can't say I paid much attention to it. I'm very happy where I am now.

"I'm not nervous. It's a great game to be involved in and we're going to have fun playing. It'll be different from the game at home. They'll need to open up a bit."