The R's are now just two points adrift of safety in the Premier League table after nine matches.
"[Dunne's] great at what he's great at and he's a great player to play behind because you know what you're going to get," Green is quoted as saying by Sky Sports News.
"He is consistent in that respect. You look at something like [last season's] playoff final. He came off man of the match and proved his worth.
"You could have signed him on a 10-year contract off the back of that game. I think Dunney was in fantastic form against his old club."
QPR are back in Premier League action on Saturday when they play leaders Chelsea at Stamford Bridge.