The 34-year-old was red carded in the second half of the Cherry and Whites Amlin Challenge Cup match against Mont-de-Marsan last Thursday.
The former England back-row star was given his marching orders for punching Sebastien Ormaechea, while a glance at video footage after the game showed that he also aimed a knee at the player's head during the incident.
The veteran flanker will appear before the disciplinary panel on October 26 and he will not be allowed to play until the hearing has taken place.
It looks likely that he will receive a ban, which could range from two to 52 weeks, and the minimum sanction for use of the knee is three weeks.
The West Country outfit were unhappy with a number of incidents in the match and felt Hazell himself had been the victim of a gauging incident.
But citing commissioner John West dismissed the claims as there was insufficient evidence to cite any of the French players and so it will be just Hazell who has to face the music later this month.