Rangers needed to beat fellow strugglers Stoke to stand any realistic chance of the greatest of escapes but instead fell to a 2-0 defeat at Loftus Road. Peter Crouch did the damage against his former club, opening the scoring in the first half before winning the penalty from which Jon Walters made sure of the three points.
The defeat leaves QPR 10 points adrift of safety with only four matches remaining - a position Hoops boss Redknapp does not expect his side to recover from, and he said: "It looks like that's it. It is almost impossible now."
He added: "It is a big disappointment but even today I felt in the first half we were bang in the game.
"I was disappointed to come in at half-time 1-0 down as I thought we did okay in the first half. But we lack a forward ball and without Bobby Zamora it is very difficult. We've got no real target up there.
"Loic Remy needs to play off somebody as he is not a target man and it was just a problem for us.
"In the first half I thought Adel Taarabt in the hole was a threat to them and then we lose him to a shoulder injury after Andros Townsend does his hamstring. I felt the threat really disappeared then.
"I thought we would still be in with a chance at this stage when I came in, but you don't know until you get here and work with the team.
"You're not sure what you've got, who is who and how they are. But I felt we've been in every game apart from Liverpool, who battered us here and were different class.
"Other than that, we've been in every game. It is just that little dividing line that makes the difference."
- Sports & Recreation