Chelsea striker Diego Costa is reportedly interested in returning to Atletico Madrid this summer.

The 27-year-old joined the Blues from the Spanish outfit in 2014 and enjoyed a productive first season at Stamford Bridge, scoring 21 goals in 37 matches.

However, the Brazilian-born Spain international failed to hit those heights last season as Chelsea put up the worst title defence in Premier League history, although he did still find the back of the net 16 times.

Costa's form saw him left out of the Spanish squad for Euro 2016 this summer, and the recent arrival of Michy Batshuayi at Chelsea has cast further doubt over his future.

Spanish newspaper AZ reports that the player is eager to return to Atletico, where he scored 56 goals in 96 appearances between 2012 and 2014.

However, it is unclear whether new Chelsea boss Antonio Conte would allow Costa to leave the club as he looks to get the Blues back into the Champions League during his debut season in charge.