It was fans of Huracan Las Heras who started arguing with each other at the end of the match when the team led 3-1 against Ferro de General Pico.
Video images show how both players and leaders from both teams flee the arena and seek protection when the shooting breaks out.
In the riot, Ferro's coach Mauricio Romero is hit in the shoulder.
He received treatment on the spot and was taken to hospital.
It is unclear if the coach was the target of the shooting or if he happened to get in the way of an expired ball.
Has been treated and questioned by police
"Romero is well under the circumstances and is out of danger," the sports magazine Ole tweeted according to Reuters.
"After leaving the arena, he was examined at a local hospital and received treatment and then provided information to the police," Ole continues.
The internal conflicts among the fans have worried Huracan for several years.
For several years, the families have been chased from the stands, which is devastating.
Those who ruin the club must stay at home so that the real fans can return ", Huracan writes on his Facebook.