The Uruguayan international endured a rotten two-year spell at Old Trafford following his move to the Red Devils in 2002, but has since proved himself as one of the most prolific strikers in Europe.
Forlan was top scorer in La Liga last season – ahead of the likes of Samuel Eto’o, David Villa and Lionel Messi – as he netted 32 goals to help Atletico qualify for the Champions League.
However, the rojiblancos have struggled so far this term and find themselves in the relegation zone after winning just one of their opening 11 games.
Atletico’s disastrous domestic form has fuelled speculation that Forlan - and strike partner Sergio Aguero - could be on his way out of the Vicente Calderon.
And the 30-year-old admits he would find it hard to turn down the opportunity to return to England.
“England and the Premier League gave me many things and I thank them for that,” Forlan told UEFA.com.
“If I have a chance to return, I would like to go.”
Forlan scored just 17 goals in 95 appearances during his time in the Premier League but doesn't believe he has anything to prove.
“I feel I have nothing to prove there,” he added.
“The only difference is that I am more experienced today.”
