Forlan had an unsuccessful stint with Manchester United earlier in his career, when it took him eight months to score his first goal for him the club and he left after just two-and-a-half years.
However, he has gone on to become one of the most feared forwards in the game since switching to Spain in 2004, enjoying a prolific three-year spell with Villarreal before joining Atletico.
Champions League qualifiers Tottenham have been linked with the Uruguayan, who hints he has unfinished business in England.
"If there is an offer and it's good for Atletico and good for me I would be really happy to go back to England. But it will have to be good," the 31 year old said.
"If a big chance to return to England came up, I would have to look at it. I loved my time in English football - the people, the fans, the football, everything.
"I wasn't sad the way it ended at United to be honest. I was really happy during my time there and thank the people at United for how they treated me.
"During my period there I learnt a lot of things and had a good relationship with everyone. The reason I left was because I didn't have the chance to play as regularly as I wanted.
"Now I have the chance to play regularly the way I wanted and I am really happy I'm doing that."
"The way he treated me from the first time I arrived at Manchester was great," he explained.
"He was waiting for me in the stadium, took me to the hotel and showed me the facilities at the training ground. I really appreciated that.
"In private he is a very nice person and I have a lot of good memories of Sir Alex. He spent a lot of time with me and he taught me a lot of things."