Costa was heavily linked with a lucrative move to the Chinese Super League during the January transfer window, but has more recently been tipped to sign a new five-year contract at Stamford Bridge.
Conte is expecting to have his top scorer available to him next season, but admitted that he is unaware of any imminent new deal for the Spain international.
"I don't know about this situation. I think now it's very important to be focused on the present and not to look so far forward," he told reporters.
"At the end of the season we will see the situation. I'm confident [he will stay]. I repeat - now it's important to keep the great concentration for the present. The present is tomorrow's game against Wolverhampton. We must go in the next round."
Chelsea take on Wolverhampton Wanderers in the FA Cup on Saturday.