Saracens flanker Jacques Burger has been cited for alleged foul play following an incident in Sunday's European Champions Cup quarter-final against Racing Metro.
Burger is alleged to have hit Racing scrum-half Maxime Machenaud during the close encounter at Stade Yves-du-Manoir, which Saracens eventually won 12-11.
The 31-year-old will face a disciplinary hearing on Thursday regarding the incident, which carries a minimum punishment of a two-week ban if he is found guilty.
That would be a blow to Sarries, who face Premiership playoff rivals Leicester Tigers on Saturday before their European semi-final against Clermont Auvergne a week later.
Saracens, who have already won the LV= Cup this season, are currently second in the Premiership, just two points clear of fourth-placed Leicester and 10 adrift of leaders Northampton Saints.
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