British and Irish Lions prop Cian Healy has been cited for allegedly biting Western Force scrum-half Brett Sheehan during Wednesday's clash in Perth, the Australian Rugby Union has confirmed.
The incident in the 17th minute of the tourists' 69-17 victory was referred to the TMO but replays proved inconclusive.
Citing commissioner Freek Burger took a statement from Sheehan, who remonstrated angrily with the Irishman and pointed to his arm after a melee near the Force try-line.
Possible punishments in the event of a guilty verdict were unclear. Previous penalties for biting include an 18-month suspension handed down to South African Johan Le Roux in 1994 and a six-month ban for England's Kevin Yates in 1998.
"I don't know if it was an accident or on purpose, so we'll move on," said Sheehan.
Force coach Michael Foley played down the biting allegation, which clouded the Lions' first game in Australia.
"It's been left on the field," he said.
"It was dealt with by the referee at the time."
Irrespective of the citing commissioner's findings, Healy's tour is in doubt after he badly rolled his ankle near the end of the first half and needed to be stretchered off.
England prop Alex Corbisiero will fly from Argentina to Brisbane and join up with the Lions as injury cover Healy, the Lions have announced.
Meanwhile, Irish scrum-half Conor Murray was also in the firing line with Burger investigating claims he trampled on Force youngster Ed Stubbs in the second half.
Gatland has repeatedly warned about the importance of discipline after England's Dylan Hartley missed the tour over unguarded comments to a referee and Owen Farrell reacted angrily to a punch in Saturday's win over the Barbarians.