"I don't know about this situation because I think now it's very important to be focused on the present and not to look so far forward," Conte said.
"I think now for the players, for the people who work for Chelsea, and for me it's important to be focused on the present. At the end of the season we'll see the situation."
Asked if he was confident of keeping Costa he said: "Yes, I'm confident, but I repeat now it's important to keep the great concentration for the present.
"Tomorrow's game against Wolverhampton is the present. We must go into the next round and then, I repeat, this situation will be better to face at the end of the season."