Charlie Matthews has been cited for making contact with the eyes of Dominic Ryan during Harlequins’ 14-13 loss to Leinster.
The Quins second row was sin-binned in the closing stages of the game at the Aviva Stadium on Sunday after a scuffle during which he appeared to make contact with Ryan’s eyes.
Referee Romain Poite decided with the TMO that there was no definitive proof of a gouge, and did not send Matthews off as a result, however he will face a disciplinary investigation for his actions.
If found guilty, sanctions start at 12 weeks for low-end offences and go up to 52 weeks depending on the severity of the incident.
Meanwhile Ian Madigan and Danny Care, who were both involved in the fracas that led to the Matthews incident, have been issued with Citing Commissioner Warnings for their behaviour.
Madigan was warned for misconduct while the ball is out of play, while Care received his warning for retaliation on the Leinster playmaker.
Any player who is issued three warnings or yellow cards, or a combination of both, during the Champions Cup, will be required to attend a disciplinary hearing.
In the Challenge Cup Zebre’s David Odiete faces a disciplinary hearing for his red card during a loss to Gloucester.
The young winger was sent off three minutes after coming on for taking out Gloucester full-back Steve McColl in the air.