Green, who played in all but one of QPR's league games this season as they finished fourth in the Championship, is worried about players out on loan who are likely to be sold when they return.
Adel Taarabt and Loic Remy, who have been on loan with AC Milan and Newcastle United respectively, are two players that Green thinks will leave this summer, especially if QPR lose in next Saturday's Championship playoff final against Derby County.
"Does [Taarabt] want to come back? If we get promoted does he want to come to a Premier League scrap when he has just cruised through a Serie A season?" Sky Sports News quotes the 34-year-old as saying.
"You have people like Loic, who has proved himself again at Premier League level at Newcastle. Does he want to take half a step backwards or sideways?
"They could all come back and play in a marvellous part of next season which we would welcome with open arms. But you wonder."
QPR are looking to achieve an instant return to the top flight after their relegation in 2012-13.