The Brazil international is being linked with a summer move across London to the Emirates, with the 33-year-old reportedly reluctant to drop down a division to the Championship.
Arsenal are, coincidently, the visitors to Loftus Road on Saturday.
Cesar is thought to be keen on the move and Redknapp said: "He wants to go to Arsenal? Arsene Wenger will be here tomorrow, if he's interested, I'm sure he'll speak to me.
"He's a top, top goalkeeper. There's no doubt about that. He's a Brazil international so for him to play in the Championship next year would be difficult. I can understand that.
"But he's a good goalkeeper. It would take a good offer. How this game works is you buy players and those who don't do well, you're stuck with them but those who do well, they think they'll walk away for nothing.
"You've got to get what you feel is value for him. He's going to cost decent money if anyone wants to buy him. He's a good goalkeeper."