Warnock and Benitez have history, but the Bluebirds manager is looking forward to facing Benitez again tomorrow.
"You've only got to look at what the fans are saying," Warnock said. "But the one person Newcastle can't afford to lose is Rafa. I think they can get away with any player.
"He's in his last year now and it'll be interesting to see how that develops because he'll be targeted around the world I'm sure.
"Everything's been said about what happened and we've met a few times since. Life's too short and I've got to enjoy this now with a full house."