The Royals were also condemned to relegation following an uneventful 0-0 draw at the Madejski Stadium, meaning both sides will now play in the npower Championship next year.
"There are problems within the club," conceded Redknapp. "It is not easy to change when people have got contracts - I've heard over the years that players will want to leave because you have been relegated but where are they going to go?"
He added: "If they had played better perhaps we wouldn't have gone down,. one or two will be wanted by good clubs.
"There are an awful lot here that have good contracts and it would be hard to get rid of them even if I wanted to shift them. You can't shift people on two or three-year contracts for good money.
"It has not been an easy club to manage, but if it had been easy I wouldn't have got the job. They offered me the job because that is the situation they were in, otherwise I wouldn't have got the job, (former boss) Mark (Hughes) would have still been sitting here now. I'm only concerned about the owners of the football cub. QPR are not a super power going into the championship."
Reading manager Nigel Adkins came into the club in March after Brian McDermott was relieved of his duties.
The Royals have picked up two points from his opening five games and Adkins, who brought Southampton up from the Championship last year, is now targeting a similar success with Reading.
"The fact of the matter is we're down," he said. "We needed to win and we haven't, what we have to do now is get ourselves ready for the Championship.
"We know where we are going to be for next season now. We have players who have experienced the Championship, but like all clubs there will certainly be players coming and going."
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