Multiple media outlets have reported Bullemor will be released by the Broncos to take up what is believed to be a three-year deal at Narrabeen.
He came onto the NRL scene last year but has made 17 appearances for the club this season and is one of their talented young forwards.
It will add to the Sea Eagles’ depth.
The Dragons are set to sign Sea Eagles centre Moses Suli, after Manly dug their heels in over a payment they made to acquire Jason Saab from St George Illawarra last year.