Zimbabwean-born Mujati, who came on as a replacement for Saints could face a six months to a life ban, after he was cited for physical contact with a match official in contravention of Law 10.4 (l) l.
The citing were lodged by the citing commissioner for the match, Murray Whyte of Ireland.
Former Zimbabwe Under 21 international Mujati, who has 12 caps for the Springboks, joined Northampton in the off-season from South Africa franchise Stormers. Under IRB regulations he faces a minimum 24-week suspension if he is found guilty with a life ban the maximum punishment available for the disciplinary committee. — Sapa.