Tuqiri will meet the Waratahs, Brumbies and Queensland Reds in the next two weeks to decide where he will be playing
"I have not made this decision lightly. It is difficult leaving rugby league a game which has given me so much," he said.
"I will be totally focused on helping the Broncos regain the NRL premiership over the next three months."
Considered by many to be the world's best winger, Tuqiri featured in a Broncos premiership winning side, captained Fiji in the Rugby League World Cup, played for Queensland in the State of Origin and represented the Kangaroos with distinction.
Tuqiri follows fellow Rugby League Test wingers Wendell Sailor, Mat Rogers and Nathan Blacklock into rugby union.