Fernando Torres admits he would like to work under former team-mate Diego Simeone at Atletico Madrid and is unsure over his long-term future at Chelsea.
The Blues have been linked with a move for Atletico striker Diego Costa with manager Jose Mourinho concerned about the lack of goals in his side.
Mourinho was secretly recorded by French television station Canal+ saying that "the problem is we lack a scorer" and has targeted Costa, who has a £32m release clause in his contract.
Torres has two years left to run on his Stamford Bridge deal and hinted he would be receptive to a return to Atletico, where he played alongside current manager Simeone for two seasons.
When asked in Spain if he would return to Madrid, Torres told AS: "In football you never know. You can't be sure where you're going to be tomorrow or in a week or in 10 years.
"I have a lot of admiration for Cholo (Simeone) from when we were team-mates. He helped me a lot and taught me to be captain. He taught me many things in our seasons together at Atleti.
"I always want to work alongside people I admire. I admired from the outside Rafael Benitez and had the opportunity to work with him. It was the same with Jose Mourinho and Luis Aragones.
"I have been fortunate to work with people who you say from the outside 'What do they have? What is their secret? Why do all their teams win?' Simeone is like (Pep) Guardiola or other coaches. You'd get to see how they train.
"The twists and turns of life are unknown. I don't have to meet Simeone either here (at Chelsea) or with Atleti. Who would have said I would work with Benitez at two English teams?"
Torres commanded a British record fee of £50m when Chelsea bought him from Liverpool three years ago and despite only scoring 43 times in 161 games, the striker is pleased with his contribution to the team's trophy haul in that time.
"If a club pays £50m for you, certain things are expected and, if things go badly, the criticism is much heavier and the reactions are much more extreme," said the 30-year-old.
"If things go well, that's seen as normal, because you're expected to score. The Chelsea fans understand that completely.
"In two-and-a-half seasons, I've won a Champions League, an FA Cup and a Europa League, and I still have years remaining at Chelsea in which to keep on winning more trophies."