The Spaniard was proud to keep a clean sheet at Anfield on Tuesday, even though it could be the last in his football career.
He admitted he may have played the final Champions League game of his career in Porto’s clash with Liverpool on Tuesday, but he feels he is signing out in a grand way.
The Portuguese side at Anfield held the red to a draw on Tuesday, bowing out of the European Champions league having lost on an aggregates of 0-5.
Casillas, 36, will be a free agent at the end of the season when his contract expires, meaning he may not get another chance to win a fourth Champions League crown in his career.
However, in shutting Jurgen Klopp’s side out in Merseyside, Casillas feels he can be proud of his potentially final European game.
“If this was my Champions League farewell, it hasn’t been a bad night at all – at this fantastic stadium, keeping a clean sheet… but no one knows what the future holds,” he told reporters.
“If I look back, I can feel proud of the things I’ve won in the game, of everything I have achieved. I would like to thank the fans. It’s been many years in the Champions League and it’s great to come to a stadium like this and be given such a warm reception.
“Congratulations to Real Madrid [for beating Paris Saint-Germain], let’s hope they go as far as possible, and get to the final in Kiev.”
The World Cup winner has the rest of the season to see out with Porto and is targeting a Primeira Liga title to close his career, with his side sitting five points clear of Benfica after 25 matches.
“My objective is to win the league with Porto because this group of players deserves to lift the trophy,” he added.
“We’ll see what happens at the end of the season.”