Esperance fans clashed with police at the Olympic Stadium in Rades prior to the kick-off of their CAF Champions League semi-final tie against Al Ahly on Saturday.
The clashes started after a large number of Esperance fans forced their way into the ground despite COVID-19 restrictions.
Al Ahly had to abandon their pre-match warm-up when tear gas drifted onto the pitch as police tried to control the home fans in the stands.
The game was delayed for an hour.