Harry Redknapp's side secured their spot in the playoffs by beating Watford 2-1 on Monday, and Green believes that the more experienced members of the squad will be crucial if they are to return to the Premier League.
"There are key moments in games when you need people to step up," the 34-year-old told members of the media.
"We have got players coming back to full fitness who can really affect games. You can be well organised and disciplined but having key players turning up at big times is a huge thing.
"The playoffs are intense and you would like to have the players we have on our side. The guys who have been around know what to do on big occasions."
QPR are currently fourth in the Championship with two games remaining before the playoffs begin.