Barton is currently on a season-long loan at Marseille.
He said: "He's a top manager. I don't think anyone doubts that for a minute. He always does well with players and gets players on board.
"What it seems to me as a neutral - and I am in France, no matter that I am contracted - looking at the situation at Loftus Road is that they have got a big case of a lot of good individuals, a lot of good quality individuals, but not a good team.
"If anyone can pull the lads together then a manager of Redknapp's calibre is capable of that.
"I really hope they do it. I wish them nothing but success."