The new deal will see the versatile forward join Wests Tigers from the start of the 2018 season until at least the end of the 2019 season.
Rochow has played 82 first-grade games since making his debut for the Melbourne Storm in 2010 — coming through a Grand Final-winning Holden Cup team before spending two years in the Storm’s first-grade system.
In 2012, the Maitland-born Rochow moved to Newcastle, going on to play 72 games in five years with the Knights, and made his representative debut for Country in 2014.
The East Maitland Griffins junior joined South Sydney for the start of the 2017 season — playing eight games — before re-joining the Storm on a mid-season transfer.
“Robbie is an experienced player who will fit in well with the culture that we’re building here at Wests Tigers,” said Cleary. “We look forward to giving him the opportunity to build on the way he started his career.”