The English manager believes it will be hard for his side to bounce back to the Premier League at the first time of asking after a 0-0 draw with Reading sealed their fate
The west London side were relegated along with Reading after the two played out a 0-0 stalemate at the Madejski Stadium on Sunday afternoon.
Redknapp will now be tasked with building a promotion-winning side for next season but he believes the second tier will prove very difficult going.
"There are massive clubs in that division," he told reporters. "QPR are not a superpower going into the Championship. If you look you'll see several big clubs that have won things over the years."
The Rs boss has previously described a split within the dressing room he inherited at Loftus Road and was disappointed with the manner in which their relegation confirmed.
"It was a mundane sort of game," he added. "It was as though both teams knew they had gone down.
"There are problems within the club; it's not been an easy club to manage. The balance of the team, in all honesty, was never quite right."
Nigel Adkins, meanwhile, believes the Championship-winning players in the Reading squad will stand them in good stead for a promotion charge next season.
"We've got eight or nine players who have sampled the Championship before, having won it, so the experience of that puts us in a positive light," the former Southampton boss said.
"Obviously it's a very sombre dressing room. What we've got to do is bottle up that feeling and make sure we never feel that again, because it's not a nice one."