Despite extending their unbeaten Barclays Premier League run to five matches, the Hoops are six points of safety as a missed second-half penalty by Adel Taarabt proved costly.
Redknapp handed debuts to £12.5million centre-half Christopher Samba and on-loan Tottenham midfielder Andros Townsend, while Jermaine Jenas came off the bench.
With £8million striker Loic Remy set for a spell on the sidelines after suffering a groin injury in training on Friday, such a hefty outlay during the January transfer window could prove money laid without reward should QPR fail to climb out of the bottom three.
Redknapp, however, insists no matter what happens over the next four months, all players brought in were sound investments.
"Everyone is going on about Samba. You will sell Samba at the end of the season if you want to sell him because Samba should be playing for a top four team," Redknapp said. "He is a monster of a player, as quick as lightning, fantastic in the air, can play. He has got the lot and is the full ticket.
"At the end of the season, if it doesn't go well, they will go and get £12million for Samba, not a danger. There will be managers out there who will be thinking 'I thought he was gone, but now he is back in England'.
"There will be takers for Samba all day. So they have not done their money on Samba.
"Remy for £8million, if he can come and score a few goals, he will be £12million. We (Tottenham) tried to buy him for £18million last year. The two kids from Tottenham. One was three grand (a week) and the other one doesn't come to a lot of money.
"I have not brought players in here who were s , that we can't give them away. They are good players. The club's invested, but they will get their money back on those players."
- Sports & Recreation
- Christopher Samba