He spoke to SER Catalunya to explain that "it's an option that's always there and that I hope it could happen".
Pedro said: "Everyone knows what I feel for the club and it's evident that it's a possibility to go back. I've always said it. It's a club I have special love for because I support them. I've had so many experiences there and was there so many years, I feel loved by the fans."
The 32 year old forward, in his fifth season at Stamford Bridge, added: "I don't know if it's in the hands of the president, the coach or whoever. I think for them my return is difficult but it's clearly a possibility."