The 34-year-old has often been his side's driving force from a deeper role in midfield, although the likes of Aston Villa and West Ham have marked him out of the game en route to defeating the Reds.
And Redknapp believes that is exactly what the Rs must do if they are to have any hope of beating Brendan Rodgers' side in west London this weekend.
"Unfortunately for Steven, at the moment teams have figured out the deeper role he’s playing and they’re pushing men on to him," Redknapp wrote in his weekly Sky Sports column.
"Aston Villa did it and other teams have looked at Gerrard and put him under pressure. And that’s what QPR have got to do on Sunday.
"You can’t let Gerrard pick passes out. He’s had a nice two week break and he should be really fresh but QPR have to go and put him under pressure and make it difficult for him.
"Whether you’re 24 or 34 no one wants to play football under pressure, everyone wants time. If you get under a player’s skin and stop them playing it’s a totally different game."
Redknapp also rounded his column off by predicting a 2-2 draw for Sunday's Loftus Road clash.