Julio Cesar, 34, has yet to feature for QPR this season following their relegation to the Championship, and has been linked with a move to Manchester City.
The Brazil international is keen to get games under his belt ahead of next year's FIFA World Cup - an ambition that Redknapp is willing to help him fulfil.
"We wouldn't stand in Julio's way and we aren't asking a fee for him," Redknapp said.
"He needs to play and he could play anywhere for any team. He's just been unlucky.
"Rob (Green) has been fantastic and I can't take him out of the team.
"However, Julio's a great guy, and he needs to play soon, so he can play in the World Cup."
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