Warnock knows what it is like to be ushered out of Loftus Road - he lost his job in January just months after taking the club to promotion - but he does not want to see them relegated.
"I would like to wish Harry Redknapp the best of luck filling my old seat in the dugout at Queen's Park Rangers," he wrote in the Independent.
"It was one of the achievements of my managerial career getting QPR back into the Premier League after a 15-year absence and I would be very sad to see them go back down after all the hard work the players, staff and myself put in.
"Neither the fans nor the owners, Tony Fernandes and Amit Bhatia, deserve that."
Warnock made no secret of his disappointment at losing his job, feeling he deserved credit for having taken the club back to the top flight after a lengthy absence.
He has also been angered by some of the comments made by Hughes since his appointment and feels Fernandes may now regret ever letting him go.
The Leeds manager added: "I have to admit there have been times this year when I have had to bite my tongue. I kept hearing the team were playing well without getting the results they deserved: so were mine but we did win away from home three times.
"There was also the comment at the end of last season when my successor said after coming 17th, the same position I left them in, 'we won't be in this position again'. Unfortunately he was proved right; QPR have not been that high since.
"It was difficult to accept when I was replaced. Having met the mandate of keeping out of the bottom three we were about to make the signings in the January window we needed to head towards mid-table.
"Having kept QPR up I planned to retire and hand the reins over to someone else for a smooth transition. It is easy to look back in hindsight but I think Tony might now reflect and feel that would have been a better way to proceed."