The goalkeeper was jubilant after Sergio Ramos took the Champions League final into extra-time before Real Madrid beat Atletico with a 4-1 win
Atletico Madrid took the lead as Diego Godin headed over the onrushing Casillas nine minutes before the break and looked set to secure an upset until Sergio Ramos struck in injury time to force the tie into extra time.
Casillas showed his appreciation to Madrid and Spain team-mate Ramos with a kiss after the 90 minutes had been played out and eventually lifted the trophy after goals from Gareth Bale, Marcelo and Cristiano Ronaldo wrapped up a 4-1 win.
"La Decima is so important, it’s more so than the World Cup," Casillas told reporters after the match. "It’s been so long to wait for La Decima, but it’s a round number, a perfect number.
"I want to congratulate those who have come here and thank the fans who have not said anything bad. We suffered. They got a fortunate goal when I made a mistake.
"They had more chances and we kept coming several times. We suffered more than necessary into stoppage-time. It seems like a fair result. They defended well, killing time at the end of the 90 minutes, but we did it.
"It’s what we have. Hopefully people will remember La Decima was won in Lisbon. Sometimes we fail, other times we hit the jackpot and I can’t complain."
The European cup is Madrid's second trophy of the season, after they lifted the Copa del Rey last month with a 2-1 win over Barcelona.