Suspensions are on the cards after a fight in the crowd marred the battle for the Group Nine minor premiership on Sunday.
A video of the altercation between a Tumut supporter and his Gundagai counterpart late in the game at Anzac Park has gone viral.
Group Nine and Country Rugby League are investigating the incident.
Group Nine chairman Peter McDermott said it took the shine off the big game, and a big result for the Tigers.
"It's a terrible look for the game," McDermott said.
"I wasn't there but everyone told me it was a really good game, everyone was well-behaved and it is very sad that this is how it ended."
Those involved will front the Group Nine judiciary if they are found to have a case to answer this week.
The judiciary has the power to ban spectators from games.
It is a change of approach this season, with previous incidents to be heard by the Group Nine board.
It was the only incident in the large crowd between the two traditional rivals.
Over $8100 was paid through the gate to see who would finish on top of the ladder heading into finals.
The incident is believed to have been sparked after comments from the Gundagai supporter towards the Blues players following Damian Willis' try late in the 34-6 victory.
While Gundagai had extra ground managers on hand for the highly-anticipated clash, Tumut president Bryan Black didn't believe it was enough.
"The ground managers weren't doing their job and were avoiding it like the plague so obviously a Tumut supporter took it into his hands to sort it out," Black said.
He admitted it got out of control, with fire crackers another concern.
It's not the first time Tumut have been involved in a fight this season after an altercation at their season launch earlier this year.
Gundagai president David Tout didn't want to comment on the incident, preferring to focus on what he said was a great day of football, but believes if security is required it would break the club.
Tumut hosts Southcity at Twickenham in the qualifying final on Sunday with the winner to tackle Gundagai for a place in the grand final at Anzac Park the following week.