England hooker Dylan Hartley has been cited for an alleged biting incident during the Six Nations match against Ireland on Saturday.
The Irish flanker Stephen Ferris drew attention to it during the first half of the match, but the referee Nigel Owens did not see anything himself.
The lowest suspension for biting is 12 weeks, the top entry level 24 weeks, with a maximum sanction of four years.
The player's hearing will be held by an independent disciplinary committee.
A Six Nations statement confirmed he was cited under the law regarding "acts contrary to good sportsmanship".
Hartley had a six-month ban for eye gouging while playing for Northampton against Wasps in 2007.
The Rugby Football Union issued a brief statement following Hartley's citing, saying: "The England management have been formally notified about the citing of Dylan Hartley and will not be making any comment until the resolution of the disciplinary hearing."