Redknapp's side go into Sunday's Sky Live clash with Liverpool at Loftus Road six points adrift of safety after successive defeats to Newcastle and West Brom.
Former Tottenham boss Redknapp admits he would like to bring in a couple of new faces but insists he does not feel obliged to do so.
He also refuted suggestions QPR have made an approach for Fulham centre-back Brede Hangeland.
"If we can get one or two in, we'll give ourselves a chance. That's what I'm looking at," he said.
"If I can't bring in people who I think can do the job for us, then I won't bother. There's no point signing players for the sake of it.
"I've got to sign people in the right positions who can help us. If we can't do that, we may as well sit tight and see what happens."
The future of full-back Jose Bosingwa has come under scrutiny after he refused to take his place on the substitutes' bench for the game with Fulham on 15 December.
But Redknapp warned he will have to think carefully before letting any players leave the club.
"We'll have to look at that and see how we're going in January," he added.
"I can't look to get rid of anyone - I had to pull in a kid who had been on loan at Yeovil on the bench against West Brom.
"We're certainly not over-loaded. Out of the 25 we have long-term injuries. I won't shift people out unless I get some in."