Atletico Madrid have reportedly asked to be kept updated on developments regarding Diego Costa's situation at Chelsea.
Costa scored 20 goals to help fire Chelsea to the Premier League title this season, but speculation over his future has rumbled on since he was linked with a move to China in January.
The 28-year-old has refused to publicly commit his future to the Stamford Bridge club and waved to each corner of the ground when he was substituted during Sunday's season-ending win over Sunderland.
Chinese Super League club Tianjin Quanjian are still understood to be interested in the Spain international and are reportedly willing to pay up to £76m for the striker, in addition to wages of more than £25m per year.
Atletico would not be able or willing to match those terms, but The Telegraph reports that they have asked the player's representatives to be kept updated on the matter.
Atletico attempted to re-sign Costa last summer and the player himself is likely to favour a return to the Spanish capital - where he scored 64 goals in 135 appearances - over a move to China.
Any bid for Costa is likely to depend on whether Antoine Griezmann leaves the club, though, with the France international claiming recently that he is 60% likely to join Manchester United.
