The former Crystal Palace manager was sacked by the West London club following a string of disappointing results, which caused the side to plummet down the table with just one point above the relegation zone.
"When I look at how managers at other clubs in the Premier League have been given unequivocal support by their board it is an understatement to say I am very disappointed," Warnock wrote in The Telegraph.
"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've 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. Will a new manager make a difference? Not as much as new players will. If you haven't got the players you can't win games, that's another fact of life in football management. I just wish I had the chance to bring in the ones I wanted, both in the summer, and this month."
Former Fulham manager Mark Hughes is expected to be announced as the club's new coach today.