Cooper Johns signed an NRL contract with the Storm.
Fox Sports reports the 17-year-old has signed a two-year development deal from next season.
He is the youngest son of Matt and nephew to Andrew.
The pair famously led Newcastle to a maiden premiership in 1997 as halfback and five-eighth.
The teenager played for Manly’s SG Ball side this season in the No.6 jersey.
PHOTO: News Corp Australia.