Casillas played for Aragones with Spain.
"Luis has changed the history of Spanish football. It's a sad day for everyone. May he rest in peace. I had a very good relationship with Aragonés. He was loved by everyone," he said.
"On behalf of the squad, I'd like to express our grief for the passing of Luis Aragónes".
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball