Real Madrid legend Iker Casillas isn't surprised by the hype around Porto teammate Eder Militao.

The Brazil defender has been linked with Manchester United and Real Madrid this season.

"He has a lot of quality and is keen to learn," Casillas told Onda Cero.

"He came to the club this summer but has adapted very well and his versatility is the key, he is a key player for us.

"He is a good guy who develops a lot in a short time, so he has a huge future ahead of him."