St George Illawarra captain Ben Hunt suffered a fractured arm during the Dragons' loss to the South Sydney Rabbitohs on Sunday night.
Hunt played the entire 80 minutes against the South Sydney, with his kicking setting up the Dragons first two tries.
Hunt doesn't require surgery but will miss at least the next month.
He has played 15 games for the Dragons in the 2021 season, where he has assisted on 13 tries and scored five of his own.
Hunt's injury comes as the team looks to get back into the top eight following a turbulent month of suspensions and three straight losses.
Hunt's replacement as captain and at halfback will be determined this week when coach Anthony Griffin names his Round 21 squad to face the Canberra Raiders.