Racing 92 have slammed the "grotesque" decision to only fine Saracens for fielding an ineligible player in their Champions Cup match last month.
Sarcacens secured a European Champions Cup quarterfinal spot with a crucial 27-24 win over Racing 92 at Allianz Park on Sunday.
England and Saracens back-row Billy Vunipola is a doubt for the Six Nations after suffering a suspected broken forearm.
Munster doctor Jamie Kearns was disciplined for verbally abusing Saracens hooker Jamie George.
Champions Cup organisers have launched an investigation into a mass brawl between Saracens and Munsters players on Saturday.
Saracens were crushed 30-10 by French side Racing 92 in the opening game of their European Champions Cup title defence on Sunday.