After West Ham United supporters were attacked during their defeat in the Europa Conference League semifinals, AZ Alkmaar issued 43 stadium bans.
A number of Hammers players confronted the group of supporters who had targeted a location where their friends and family members were present, but who were unharmed.
The Premier League team prevailed 3-1 overall after winning the second leg in the Netherlands by a score of 1-0.
The Dutch club warned that additional suspensions might come in the future.
The governing body of European football, Uefa, will examine the incident reports before making a decision.
The group stated:
“In response to the unrest from last week, AZ has now banned 43 stadiums. It relates to guests who were involved in the improper behavior that occurred in Alkmaar during the European semifinal.
“The possibility of additional local stadium bans is not at all ruled out. The criminal investigation by the authorities is still going on, despite this club decision.