But the Spain international was linked with a move away from Stamford Bridge to the Chinese Super League last month.
The striker is yet to agree terms over a new deal with Chelsea, but Conte is confident the 28-year-old will stay in west London.
Antonio Conte is confident Diego Costa will stay at Chelsea
“It is important to focus on the present.
“For the players, for me it is important to focus on the present new messages.
Chelsea star Diego Costa has 15 Premier League goals this season
“We must go into the next round and then this situation will be better to face in the summer.”
Chelsea are thought to be preparing a £220,000-a-week contract for Costa to keep the Spain international happy in west London.
That is to combat a £30million-a-year offer from China that would make Costa one of the best-paid players in world football