He was mentioned by the German in his favorite 5
Manuel Neuer is considered the best goalkeeper in the world. Having won the World Cup last summer, the Bundesliga with Bayern and having been semifinalist in the DFB-Pokal and in the Champions League, it's normal that people concede him this merit.
In an interview at the website Squawka, he was asked about his favorite goalkeepers, and this was the answer:
“I’m not going to get into comparisons, but there are many goalkeepers I admire. You can talk about Courtois, De Gea, Casillas, Bravo, Buffon — they are all doing extremely well. It is not for me to judge who is the best. I just concentrate on my team and my job.”
So one of Barcelona's goalkeepers, Claudio Bravo, is in the list. Former Blaugrana Víctor Valdés wasn't included by him, as the Catalan has hardly played for a year, due to his injury. His compatriot Ter Stegen is not included neither; he has a brilliant future ahead but he has not had time to show all his potential yet.