The Brazilian goalkeeper only joined the R's from Inter Milan in 2012, but with the team having been relegated to the Championship, Redknapp believes that it will be difficult to keep hold of the 33-year-old.
Instead, the veteran manager has revealed that Robert Green will keep goal next season.
"I don't see Julio being here next year - he's not a player for the Championship. He's a player for a top Italian or Spanish, or Premier League team," the London Evening Standard quotes Redknapp as saying.
"Julio's got the World Cup coming up and he's the top Brazilian keeper. Rob's come in and done great for me. He's the one we're looking to play next season."
Cesar has recently been linked with a switch to Inter's city rivals AC Milan.