Costa struck a crucial second-half penalty at Stamford Bridge last night to put his Atletico Madrid side in the lead on route to a 3-1 victory.
And after knocking Chelsea out of Europe, the Spanish international admitted he could be pulling on a blue shirt next season.
“Chelsea in my future? We’ll see, I know there are offers for me,” Costa reportedly told Sky Italia.
“I feel well here at Atletico. Let’s see.”
Jose Mourinho is keen on a £35million deal for Costa, who has scored 35 goals this season.
But the 25-year-old remains focused – for the time being – on winning a domestic and European double for Atletico.
“We deserve to be in the final,” Costa added. “The team kept their heads despite the [Fernando] Torres goal, we were very strong throughout the game.
“I just took a knock, it’s nothing serious,” he said of the injury that forced him off with 15 minutes to go.