Robinho decided to leave Real Madrid for Manchester City on Monday.
“It is not something I am pre-occupied with because it’s all in the past. Every player decides on their own future and Robinho has chosen to leave Real Madrid,” the Spain skipper said at a press conference.
“I am grateful for what he has done for the team and I wish him all the best in Manchester City.”
Casillas also commented on Real Madrid’s failure to bring in the players they made moves for this summer.
He said: “I don’t think it has changed anything. And I do not believe that these players said no to Real Madrid.
“They all want to come but obviously, there are negotiations and it is necessary to come to an agreement first.”