Los Angeles: Chelsea manager Antonio Conte is uncertain about the future of Diego Costa, as Spanish media reports have linked the striker with a possible return to Atletico Madrid.

The 27-year-old, who joined the London club from Atletico in 2014, did not feature in Chelsea’s 3-2 defeat by Real Madrid in a pre-season friendly on Saturday due to a back injury.

British media reports are also linking Everton striker Romelu Lukaku with a potential move back to Stamford Bridge.

“Today Costa is Chelsea’s player. Tomorrow if you ask me if Costa will remain with us, I don’t know,” Conte told reporters.

“I can say that today Costa is a Chelsea player. He didn’t play in these games because of injury and if he solves the injury and I see in training he’s in good shape, it can be possible to see him in the next game against AC Milan.”