Nineteen-year-old Jett has transferred from the Penrith Panthers, where Ivan is a three-time premiership winner alongside elder son Nathan.
The youngest Cleary was born in Auckland when his father was in his first year as assistant coach of the Warriors. Jett played for St Dominic's College in Penrith and the Panthers' development teams in the Harold Matthews Cup (under-17) and the SG Ball Cup (under-19).
"It's an exciting time for us to be able to bring a player of Jett's quality into our pathways system from next season," said Warriors chief executive Cameron George.
