England and Saracens back row Billy Vunipola has been cited for allegedly striking Leicester's Mathew Tait with his head last Saturday.
The incident occurred in Saracens' 22-6 Premiership win at Allianz Park.
If the 22-year-old is banned, Saracens will be without Vunipola for the European Champions Cup semi-final at Clermont Auvergne this Saturday.
Leicester centre Vereniki Goneva has been cited for allegedly striking Saracens' Kelly Brown with his forearm.
The two cases will be heard by a three-man panel in London on Tuesday.