Watson dislocated the shoulder in Sunday’s match at Allianz Stadium against the Sydney Roosters.
Initially, there were concerns that Watson would require surgery which would have required three to five months of recovery.
Scans have since revealed Watson has a capsular injury to his left shoulder.
The club’s medical staff has consulted with an orthopaedic surgeon and believe managing his shoulder conservatively is his best option.
Watson will now undergo an intensive rehabilitation program.