Redknapp can pile more misery on the Potters by guiding relegation-haunted QPR to three points at Loftus Road.
He said: "Absolutely the criticism he's had is unfair. He's done very well and has taken the club to another level.
"They established themselves as a good mid-table Premier League club. They're a good club, well run with a good manager.
"They have had a blip and I'm sure Tony is finding out know who his friends are. People desert you at times like this.
"When confidence goes it can very hard to put your finger on why it's not there. You look for answers to what has happened and they're not easy to find."