Casillas lost his place in the side to backup César Sánchez after poor performances in the 2001–02 campaign, but redeemed himself when Sánchez suffered an injury in the final minutes of the 2002 Champions League Final.
Casillas came on and pulled off several key saves to deny a rampant Bayer Leverkusen the Champions League crown.
Real Madrid won 2–1.

The 2007–08 season was a fruitful season for Casillas, as he helped Real Madrid reclaim their 31st La Liga title and conceded only 32 goals in 36 matches to claim the Zamora Trophy.
On 14 February 2008, he and club captain Raúl were awarded contracts for life; Casillas signed a contract extension that would keep him at the club until 2017, with an automatic extension if he played 30 competitive matches during the final season of the contract and a buy-out clause of £113 million.
His performances earned him a spot in the UEFA Team of the Year for the second time.

In February 2009, Casillas equalled Paco Buyo's record of 454 matches played for a goalkeeper and has since surpassed it to become Real Madrid's most-capped goalkeeper of all time at only 27 years old.
During the 2009 summer transfer window, some Spanish media reported that Manchester City had launched a record £129 million bid for the goalkeeper.
The club denied the rumours, however, saying that no such offer had been made.
Manchester United had been rumoured to have enquired about him, but no price was announced.
He had been linked with other Premier League clubs before but Casillas himself stated that he "had no intention of leaving" his boyhood club.

During the 2009–10 season on 4 October in a game against Sevilla, Casillas made an extraordinary save, running from one side of his goal to the other to deny Diego Perotti in a one-on-one, close-range encounter.
After the match, he received praise from fellow Spanish goalkeepers and England goalkeeper Gordon Banks, who stated, "Casillas' reflexes are incredible.
If he continues to play this well he will become one of the best goalkeepers in the history of the game."
Europa Press reported that Casillas was the second-most popular Spanish sportsman on the Internet in 2010.
The study performed by company Vipnet360 examined the web presence on platforms like Facebook, Twitter and YouTube.
Casillas lost his place in the side to backup César Sánchez after poor performances in the 2001–02 campaign, but redeemed himself when Sánchez suffered an injury in the final minutes of the 2002 Champions League Final. Casillas came on and pulled off several key saves to deny a rampant Bayer Leverkusen the Champions League crown. Real Madrid won 2–1.
The 2007–08 season was a fruitful season for Casillas, as he helped Real Madrid reclaim their 31st La Liga title and conceded only 32 goals in 36 matches to claim the Zamora Trophy. On 14 February 2008, he and club captain Raúl were awarded contracts for life; Casillas signed a contract extension that would keep him at the club until 2017, with an automatic extension if he played 30 competitive matches during the final season of the contract and a buy-out clause of £113 million. His performances earned him a spot in the UEFA Team of the Year for the second time.
In February 2009, Casillas equalled Paco Buyo's record of 454 matches played for a goalkeeper and has since surpassed it to become Real Madrid's most-capped goalkeeper of all time at only 27 years old. During the 2009 summer transfer window, some Spanish media reported that Manchester City had launched a record £129 million bid for the goalkeeper. The club denied the rumours, however, saying that no such offer had been made. Manchester United had been rumoured to have enquired about him, but no price was announced. He had been linked with other Premier League clubs before but Casillas himself stated that he "had no intention of leaving" his boyhood club.
During the 2009–10 season on 4 October in a game against Sevilla, Casillas made an extraordinary save, running from one side of his goal to the other to deny Diego Perotti in a one-on-one, close-range encounter. After the match, he received praise from fellow Spanish goalkeepers and England goalkeeper Gordon Banks, who stated, "Casillas' reflexes are incredible. If he continues to play this well he will become one of the best goalkeepers in the history of the game." Europa Press reported that Casillas was the second-most popular Spanish sportsman on the Internet in 2010. The study performed by company Vipnet360 examined the web presence on platforms like Facebook, Twitter and YouTube.
Iker Casillas