Casillas made 725 appearances for Real during a 16-year career at the Bernabeu, winning 3 Champions League titles and 5 La Liga crowns.
He also helped Spain win the 2010 World Cup and two successive European Championships in 2008 and 2012.
Casillas joined Porto in 2015 but has not played since suffering a heart attack during training in April 2019.
During his recovery he was given a role on the club’s coaching staff in July 2019.
Announcing his retirement on Twitter, Casillas said: The important thing is the path you travel and the people who accompany you, not the destination to which it takes you.
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