The 25-year-old, who has over 60 first grade games to his name, has signed a one-year deal with London, subject to a successful visa application.
“I’m very happy to be joining the Broncos, they have a great roster and coaching staff behind them next year and that will help drive them closer to the top,” said Stapleton who will link up with the squad for pre-season training,” he told his new club’s official website.
“It is a change of scenery, a new challenge and an opportunity to get my football career back on track. I’m excited to get there and start pre-season training and play some quality football again.
“Knowing I will be one of the senior players in the squad is exciting, sharing my knowledge and experiences with younger players will not only benefit them, but myself as well.”
Broncos head coach Andrew Henderson is looking forward to working with a player of such quality and experience.
“He’s a very experienced player who has been in the NRL system for six seasons,” he said.
“He’s played a number of first grade games so he’ll bring the experience of playing at the top level; he’s a quality athlete who is big, fast and strong.
“He’ll be exciting to watch and he’ll add some real quality to the outside backs, he can play wing, centre or full-back, but primarily he’s a winger.
“He’ll give us some versatility and add more competition for places. He’s looking forward to coming to the UK and experience something different, a different competition and a different style of football.
“He’s hoping to be a real success at the Broncos.
“He comes highly recommended, he’s not only a quality player but he’s also a decent person who is very professional. Which are all qualities I’m looking for with players I’m bringing in.”