The Brazil international, who arrived at Loftus Road from Inter Milan on a four-year deal in August, made a number of crucial saves in the London derby.
The 33-year-old twice denied Marouane Chamakh, with the Rs having to battle hard to secure a share of the spoils against the club where Redknapp began his playing career and managed.
"He's a world-class keeper. I'm lucky here, because I've got two top class keepers," Redknapp told the club's official website.
"Rob (Green) was fantastic for us at West Brom in the cup and Cesar, again, on Saturday was brilliant. You look at his CV and it's absolutely remarkable.
"He's won absolutely everything there is to win in the game and he's still relatively young for a keeper. He's world-class - a top, top goalkeeper."