Porto keeper Casillas rules on Ronaldo's Real Madrid future...

Porto goalkeeper Iker Casillas expects Cristiano Ronaldo to stay with Real Madrid.

The Real star is being linked with a move away in 2016.

Ronaldo and Casillas never always saw eye-to-eye at Real.

"Cristiano Ronaldo is a good teammate and a great athlete," Casillas told O Jogo.

"He's given tremendously to Real Madrid and I'm sure he will continue to give to the club."