Porto coach Julen Lopetegui is delighted with Iker Casillas' preseason form.
The Real Madrid legend was the shootout hero in their friendly win over Valencia.
Lopetegui said, “He is a player that comes with experience. He has arrived at the club with the enthusiasm of a 20-year-old lad.
"He has come to a big club and we are all going to benefit from his enthusiasm."