Premier League champions Chelsea are struggling to keep pace with their rivals amidst speculation surrounding the future of striker Diego Costa.
After a blistering start to his Blues career, where he netted 21 goals last term, the Spaniard has failed to maintain form and fitness in 2015/16, scoring just three goals in 12 league appearances.
Rumours of a fall-out with manager Jose Mourinho escalated during their recent visit to Tottenham, where Costa seemed to throw his substitutes bib in the direct of his manager after being told to stop warming up.
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And as a result of Costa’s recent demise, there are suggestions the Spain international could return to former club Atletico Madrid, though Mourinho suggests otherwise.
The Chelsea manager insists Costa is ‘happy’ at the club and is not contemplating a move away from Stamford Bridge.
He said, according to Sky Sports: "Atletico is a great club, La Liga is a great league, so why should a 28-year-old player not think it is possible to go back? I don’t see a problem.
"He[Costa] is happy here. He has, I think, three more years under contract."
Costa, who is actually 27, once admitted to being overweight which could provide an explanation why he has struggled this season.
Mourinho cited former players Filipe Luis and Fernando Torres as further examples of players who have returned to the Spanish capital.
It appears Costa will honour his contract, then, though fans are becoming increasingly frustrated with his underwhelming performances and tendancy to focus more on controversy and confrontation than scoring goals.
The former La Liga striker returned to action last week against Porto in the Champions League and showed signs of the hunger and determination he was renowned for last season.
However, away at Leicester City on Monday night, Costa appeared back to his usual self and held very little impact. The Blues lost 2-1, and now sit 20 points behind league-leaguers Leicester.