QPR are looking to reinforce their back-room team after seeing Steve McClaren leave to take the reins at Derby County.
A move for Ferdinand has been mooted, with the former England international still highly-regarded in west London from his playing days - during which he netted 91 times for the club.
Ferdinand was, however, taken to Tottenham Hotspur - another of his former clubs - by Redknapp and it would be difficult to tempt him away from Premier League life at White Hart Lane.
Redknapp said in the Fulham Chronicle: "I think he's well in at Tottenham now, but QPR would be close to his heart."
While a position for Ferdinand is doubtful, Redknapp has opened the door for Gallen to join his ranks - with a man who made more than 400 appearances for QPR over the course of two spells having been relieved of his youth team duties during Mark Hughes' tenure.
He added: "I would like to get him involved with the kids here because he's a real QPR man. There's got to be a place at the club for people like him.
"I did it at Tottenham. I brought Les Ferdinand out of the wilderness if you like, and Tim Sherwood too. They've done a great job at Tottenham with the young players.
"It's good to do that and give these lads a chance. This is Kevin Gallen's club, so I would love to have him back."