Everyone has their own opinion when it comes to who is the best player in the world.
Most people will say Lionel Messi, although some will plump for the mercurial Cristiano Ronaldo, while others will be torn between the indomitable pairing of Xavi and Andres Iniesta.
However, when it comes to goalkeepers, more often than not you will find that opinion is far less divided.
While if you ask the question 'who is the world's best goalkeeper?' some will rave about Buffon and others will praise Julio Cesar and respect Edwin van der Sar, nine times out of ten the answer will be the same.
The 29-year-old Real Madrid goalkeeper has made over 400 appearances for the club and has made a remarkable 116 outings for Spain, breaking into the team at the age of just 19.
His talents have been rewarded regularly and last year he added the World Cup and the Golden Glove to his CV.
Yet to reach 30, Casillas is likely to add to his appearances, caps and honours before he hangs up his gloves, breaking all kinds of records in the process, but who is going to be the next young goalkeeper to break through as the world's top stopper?