Te’o, 33, has been linked to the Broncos since being spotted training in Brisbane after his Japanese Super Rugby club Sunwolves were sidelined in March due to the coronavirus.
Seibold reached out to former England rugby international Te’o – who last played NRL in 2014 – with the Sunwolves not involved in the Super Rugby relaunch in July.
Former Queensland State of Origin forward Te’o returns to Red Hill after playing 75 games for Brisbane from 2009-12.
Overall he played 152 NRL games, also featuring at West Tigers and South Sydney where he won a premiership in 2014 before making a code switch.
He played 16 Tests for England, twice for the British and Irish Lions and he also played one league Test for Samoa in 2008.
“It’s crazy how things work out but I’m just excited to get back playing rugby league and rip in with the boys and really work hard,” Te’o said in a statement.
“The club had a spot open and need some boys and I’m ready to come and help out and play my role for the Broncos.”