Diego Costa is a huge player and it's frustrating he can't play against Chelsea, admits Atletico ace Filipe Luis

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Diego Costa has not travelled with the Atletico Madrid squad to Chelsea but his team-mates are counting down the days until he can play for them again.

Costa struck a deal to return to his former club in Spain in May but cannot register and play until the transfer market opens in January.

Filipe Luis, another player who joined Chelsea from Atletico before making the return journey after failing to settle in London, said: 'It is frustrating seeing him playing like an animal, but he can't play

Atletico defender Filipe Luis (left) and boss Diego Simeone at a press conference on Monday

Diego Costa trained with his Atletico Madrid team-mates on Monday ahead of Chelsea clash

Costa sealed a return to Atletico from Chelsea back in September for £57million 

'It's just a month until he can play with us and he will help us a lot. I don't have any doubts about it.

'He knows the club, he knows the way we play. He has already adapted. I know it was difficult times for him and for Chelsea. Now everybody's happy. We want to see him play and happy again.

'Diego is a huge player for me, because he scores a lot of goals and important goals.

Diego Simeone's Atletico side take on Chelsea away in the Champions League on Tuesday 

Simeone oversaw training on Monday in the chilling conditions in the Spanish capital

'He really wanted to come back to Atletico. That's the reason he came back.

'He was happy here. He did his job really well. His most important desire was to come back.' 

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The mood in the Atletico camp was high as they prepared to head to the English capital