The Spain international goalkeeper will embark on his 11th season at Camp Nou in 2012-13 and is slated to remain the first choice between the posts under new coach Tito Vilanova.
However, the 30-year-old insists that he is not taking his place in the starting lineup for granted.
"This is my 11th season and I have always said the same thing," Valdes is quoted as saying on Barcelona's official website.
"I have never felt that I'm the number one choice and I never will do. I have seen everything and until the very last day I come to the Ciutat Esportiva, I won't feel assured of my place."
Barcelona will begin their Primera Liga campaign with a home game against Real Sociedad on Sunday, August 19.