The former Atletico Madrid captain was given a warm welcome back by fans during the Champions League semifinal first-leg draw.
"Will I play here ever again? I am here today, so I have," he winked. "Let's wait and see. I look from match to match."
On Atletico coach Diego Simeone, he added: "We have been teammates, we have a good relationship and I am very pleased with the improvements of Atletico. That's no secret.
"I want Atletico to always wins, except for the return-leg next Wednesday at Stamford Bridge."
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