Earlier this week, the former Manchester United forward said he wouldn't consider a return to England.
But this morning, Forlan told reporters in South Africa: "They have to be a good offer (sic) and we have to see.
"I am very happy in Madrid and the way the city and the team are always with me.
"[But] you never know. If it is a good offer we have to see if the team wants me to leave or not and then we have to sit and talk."