Pep Guardiola has hailed Iker Casillas as arguably the best goalkeeper in Real Madrid's history, as he ends his 25-year relationship with the club.

Casillas will play for Portuguese side Porto next season after a deal was agreed between the two clubs for the 34-year-old on Sunday.

The Bayern Munich boss was quick to praise the goalkeeper, saying that he has a lot of respect for Casillas.

"I, of course, have great respect for Iker," Guardiola told reporters.

"He was, if not the greatest, one of the greatest goalkeepers in the history of Madrid."

Casillas made over 700 appearances for Real during his career.