Another three men were given move-on directions while one person received first aid treatment at the venue, Queensland Police confirmed.
Speaking to the Courier Mail about the incident, NRL chief executive Andrew Abdo slammed Queensland rugby league fans and threatened to impose bans.
"There's absolutely no place for violence at our games," he said.
"Aside from the action the authorities may take, we will also ban any fan who engages in violence in the grandstands. It will not be tolerated.
"Magic Round is a celebration of our game, our fans and families. Almost 150,000 fans will attend this weekend and we will speak with the Stadium, who oversees security, to ensure the right measures are in place."
On Friday, the Newcastle Knights secured a 16-6 victory over the struggling Bulldogs to break a frustrating six-game losing streak, while the Brisbane Broncos obliterated Manly 38-0 in a one-sided affair.