Former Atletico Madrid striker Diego Forlan says Iker Casillas should not be playing for Porto.

Forlan says a move to Porto for the Real Madrid legend is a step down.

“I have huge respect for Porto, a great club that's always in the hunt for titles. They spot players, they develop them and they sell them for a profit. They aren't Real Madrid, one of the biggest clubs in the world. It's a step backwards for Casillas, just like it was for Robin van Persie leaving Manchester United to go to Fenerbahce," said Forlan.

“Casillas could have left the whites a year ago, having been world champion. Just like Xavi Hernández left with full honours, having won the treble. But there are no feelings in football, it's a cruel profession. Madrid could have treated Casillas better and defended him from the attacks in the press and from his own fans. He's always had an impeccable attitude, in spite of being punished for every error."