Crouch has only scored five Premier League goals for the Potters this season, but Redknapp, who has managed the 32-year-old at several clubs, believes that the England international can have an impact on the match.
The former Spurs boss told reporters: "Crouch is always a danger. He is a good player, a great lad and a QPR fan.
"He will be a threat. We will be prepared for him."
QPR are currently 10 points away from safety in the Premier League table.