After spending 25 years with Real Madrid, Casillas left the club on a free transfer in 2015 and joined FC Porto, where he went on to win the Primeira Liga and the Supertaça Cândido de Oliveira.

He set a record for playing in the UEFA Champions League for the most consecutive seasons (20) and made the most appearances in the competition while at Porto (177). After spending nearly a year on the sidelines due to a heart attack he had while participating in a training session with Porto in May 2019, he concluded his playing career in February 2020.

#3 Manolo Sanchis (689 appearances)

Manolo Sanchis retired as a Spanish footballer who played as a sweeper.

He was one of the five members of the renowned La Quinta del Buitre, who emerged from the Real Madrid youth program, and the only one of them to play his entire career with the organization. Both he and his father, Manuel Sanchis, were international players for Spain and played for Real Madrid.

Sanch's sole club saw him participate in more than 700 competitive games, and he represented his country in one World Cup and one European Championship.

#4 Sergio Ramos (671 appearances)

Ramos joined Real Madrid in the summer of 2005 after spending two seasons with the senior team and progressing through Sevilla's development program. Since then, he has established himself as a staple for Real Madrid, winning 22 significant awards, including five La Liga championships and four UEFA Champions League crowns.

He has also developed into one of the league's best goal-scorers from a defensive position. He was consistently selected for the competition's Team of the Season since he was a key component of the preparation for all four UEFA Champions League victories. In the 93rd minute of the 2014 UEFA Champions League Final, he also netted the equalizer.