The match between Wales and Russia on Monday night has been upgraded to high risk following violent scenes in Marseille and Lille.
More than 600 extra police officers have been drafted in to ensure security in Toulouse in addition to the 1,500 already due to work.
They will help protect fans and maintain order as Wales play their final Group B game at the city in southern France.
French prosecutors blamed a hardcore of “extremely well-trained” and “hyper violent” Russian fans for much of the violence that erupted in Marseille last weekend.
“The actions are deplorable.”
It comes after 17 people were arrested in Lille on Thursday following a clash that saw England the ultimate champions of a bitter clash against Wales, which they won 2-1.
Among those arrested were six people who allegedly committed an aggressive act against a member of staff at the fan zone and others who are alleged to have let off a flare near a police officer.