Groulx was ejected before the start of the second period of a 10-4 loss to the Blainville-Boisbriand Armada on Wednesday night for yelling at officials and hurling debris on the ice over a non-call of a kneeing incident that injured one of his players.
The 44-year-old coach was upset that no call was made after Armada defenceman Vincent Richer appeared to take down Gatineau star forward Tomas Hyka with a knee late in the first period. After seeing the replay during the intermission, he argued with the officials.
The 18-year-old Hyka was helped off the ice and the team fears he may be lost for the season with a suspected knee injury.
Groulx threw sticks and a garbage bin onto the ice while pointing to his knee and screaming at the referees. He then slammed the gate shut and walked away. The incident was replayed over and over on national television.
A league spokesman said Thursday the Richer hit and Groulx's reaction were both under study for possible fines or suspensions. A decision is expected before the weekend.
The second period was marked by fights and vicious hits. A total of seven unsportsmanlike conduct penalties were called in the game.
It was Gatineau's final home game of the season. They end the regular season with two games at Rouyn-Noranda on the weekend.
Groulx won league championships with the Olympiques in 2003, 2004 and 2008. He left to coach the AHL Rochester Americans for two seasons, returning in 2010-11 to lead Gatineau to the QMJHL final.