The Spain international only joined Chelsea last August, but says he'd like to retire as a Barca player.
"Hopefully, I know it's hard, I spoke with the President (Josep Maria Bartomeu) when we were in the Cup final and spoke to all the people who want me there," he told Bein Sport.
"It's complicated, but I've always said that I would like to retire at Barca. I know it's difficult because the years go by and the club has the best players in the world, it is a very demanding club and to return is complicated.
"But do not rule it out.
"I had 11 or 12 years in Barcelona, my family is from there and also many friends. The fans loved me, I felt very valued around the club, and its always hard to leave the club of your dreams. In the end I had to take this decision because I saw that the possibilities (of playing) were exhausted."