The Blues are looking at Oblak as a potential replacement for Kepa Arrizabalaga.
However, with a Champions League quarterfinal against RB Leipzig ahead of him, Oblak insists his total focus is only on winning the tie.
The goalkeeper said, "This is not the time for that, now it's Leipzig. The balance of the season I will consider when the last game is over and hopefully we have three left.
"Then there will be time to talk. But first, Leipzig. I really want to qualify."
He added: "Lisbon is a special city for me. I came here at the age of 17, then I was on loan with several teams in Portugal from different cities, but Lisbon is the first city I went to when leaving my country. I have a special memory in my head, but it does not matter a bit to win the Champions League in Lisbon, Madrid, Milan or London, it will mean the same to me and hopefully it will be this year."