Neil Warnock has criticised the lack of support he received from the QPR board after being sacked as manager.
He was also frustrated at being denied the chance to add players in January.
In his column in The Independent, Warnock said: "When the new owners arrived, they told me my remit was to get to the new year with QPR outside the bottom three.
"We've not been in the bottom three all season. It is an understatement to say that I am very disappointed," he added.
"While I accept the owner's decision, I do feel, if there were more people at the club in positions of power with experience in the game, they would have understood how well we have done in the circumstances.
"And they would have realised that, once we brought in the players I had identified, there would have been no problem securing a Premier League future.
"But no doubt the chairman has had a string of agents in touch telling them their man could do a better job."
Warnock took over as QPR manager in March 2010 and, after keeping them in the Championship, took Rangers up to the Premier League as champions the following season.
He was then sacked with the club lying 17th in the top flight after a poor run of form that had seen them go without a win since 19 November.
But the much-travelled 63-year-old manager argues that he could have reversed the slide.
"But you can't legislate for Shaun Wright-Phillips giving the ball straight to Andrey Arshavin with half an hour left or Joey Barton getting sent off.
"A few more points and we'd be mid-table, which is where I feel our football deserves to be."