Luis' contract is up at Atletico at the end of the month and he's been linked with a move to Barçelona.
"I don't know what I will do, honestly," he said. "A lot of things can happen between now and the end of the Copa America. I promised the coach (Tite) that I wasn't going to speak with anyone until after the tournament. I think it's only fair to have my head focused here.
"When the Copa's over, I will sit down with Atletico to see what possibilities there are and after that, we will see. July's going to be a complicated month."