Chelsea striker Diego Costa wants to return to Atletico Madrid and has contacted his former employers.
This is according to Spanish newspaper Marca, who understand that while Costa feels relatively happy at Stamford Bridge and gets on with Jose Mourinho he doesn't enjoy living in London.
Furthermore, the Brazil-born Spain international misses both the weather and food in Madrid, where he lived for seven years prior to securing a £32 million move to Chelsea last summer.
Costa has enjoyed an impressive debut season in England, scoring 21 goals in 34 appearances, but his future could now be up in the air if these latest reports are accurate.
However, Marca state that Chelsea are very unlikely to sell Costa, who has become such an integral member of Mourinho's squad since his arrival.
Costa willing to take pay cut
The report also states that Costa is so determined to return to the Vicente Calderon that he's willing to take a pay cut.
Incidentally, it was reported by Spanish broadsheet El Confidential in May 2014 - two months before he joined Chelsea - that Costa had regrets about signing a pre-contract agreement with the Blues.
Atleti's CEO Gil Marin made a last-ditch attempt to keep Costa at the Calderon, but the striker would have been forced to pay a significant penalty fee in order to break off the agreement with Chelsea.
Chelsea have no desire to sell Costa
Costa has performed well in England - although failed to make an impact in the Champions League - and will remain Chelsea's first-choice striker heading into the 2015-16 campaign, regardless of whether Mourinho opts to bring the player's former teammate Radamel Falcao to Stamford Bridge.
Chelsea are under no pressure to sell Costa, whose contract doesn't expire until 2019, and are unlikely to offload their number one forward even if he submits a formal transfer request.
Replacing Costa with another reliable goalscorer would be an extremely difficult task - although not impossible for a club with the financial clout of Chelsea.
Several top-level strikers are expected to be available this summer - including PSG's Edinson Cavani, Napoli's Gonzalo Higuain and possibly Real Madrid's Karim Benzema - but there are no guarantees that any of them would have the same impact at Stamford Bridge as Costa.
Given the opportunity, Atletico would jump at the chance to re-sign Costa, particularly with Mario Mandzukic expected to leave last season's La Liga champions.
But the likelihood of any deal taking place this summer - as things stand - appear extremely slim.
Chelsea fans: are you worried Diego Costa may submit a transfer request this summer? Have your say in the comments below!
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