"It is a big step in my career and I am very proud of having taken that step, but this is not the time to talk about my transfer," he told reporters ahead of Chile's World Cup round of 16 clash against hosts Brazil on Saturday.
The 31-year-old Chile captain spent eight years at Sociedad and has started in all three of his country's Group B matches at the World Cup in Brazil.
"At 1.85 metres tall, Claudio Bravo is noted for his calmness between the posts, his leadership skills, and lots of agility," Barcelona said in a statement as they added a second goalkeeper to their squad since the end of last season.
"Since 2008, he has been the captain of Chile and at Real Sociedad he became one of the natural leaders of a team that in recent years have done really well in La Liga."
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
Barcelona's regular keeper Victor Valdes left at the end of last season, 12 years after his first-team debut, and the side have already moved to recruit Borussia Monchengladbach's Marc-Andre ter Stegen during the transfer window.
Chile won two of their three matches to advance to the last 16.
(Writing by Sudipto Ganguly, Additional reporting by Karolos Grohmann; Editing by John O'Brien)
