Everton manager Ronald Koeman has offered exiled Chelsea striker Diego Costa a surprise escape route out of Stamford Bridge.

Costa is desperate to leave Chelsea and has refused to return to training with the London club.

The 28-year-old is keen to push through a move to Atletico Madrid but complications over the La Liga club's transfer ban has made a deal difficult.

Everton manager Ronald Koeman has offered Chelsea striker Diego Costa a surprise escape

Costa is desperate to leave Chelsea and has refused to return to training with the London club

When asked if a move would be possible for Brazil-born Spain forward Costa, Koeman refused to rule it out.

'I don't know. I said always a warm welcome for every good player and he's a good player,' said the Dutchman ahead of Everton's trip to the Premier League champions. 'We are still looking to bring in a striker. We need more competition up front.'

Koeman said there had been no change in midfielder Ross Barkley's situation and he would welcome him back into the fold if he does not leave the club in this transfer window.

Koeman said he would welcome midfielder Ross Barkley back if he does not leave the club

Barkley has refused to sign a new contract at Goodison Park amid interest from Tottenham but a deal has yet to materialise.

'If Ross is staying I am pleased he stays,' added Koeman. 'He is one more good player in this season.'

Everton are set to give a fitness test to Idrissa Gueye who has a hamstring strain while fellow midfielder Davy Klaassen (foot) has been ruled out.