A Cooper Cronk-inspired Sydney Roosters have claimed the NRL premiership with a 21-6 grand final win over Melbourne at ANZ Stadium on Sunday.

Despite carrying a shoulder injury and being reduced to a bit-part role, the master No.7 directed the Roosters around the park.

After leading 18-0 at halftime, the Roosters went on with the job in the second-half with Luke Keary leading the way as they took out their second premiership under coach Trent Robinson.