Celtic midfielder Ryan Christie risks a two-match ban after allegedly trying to grab Rangers' Colombian striker Alfredo Morelos by the genitals in Sunday's Old Firm clash between the Glasgow sides.
The Scottish Football Association issued a fast track notice of complaint on Tuesday against the Scotland international for allegedly committing a sending-off offence that went unseen by match officials.
Christie had already been booked before the incident at Parkhead.
Television replays appeared to show him grabbing at Morelos's groin.
The hearing will be on January 6.
League leaders Celtic, who lost the game 2-1 with Christie missing a first-half penalty, said they were astonished at the charge and would defend their player "vigorously".
Media reports said Christie had needed groin surgery after the game following a separate tussle with Morelos.
Morelos was sent off for a second booking after a dive in stoppage time.
Rangers have said the Colombian, who appeared to make a gesture with his hand across his neck to Celtic fans following his dismissal, suffered racial abuse.
A year ago, Morelos appeared to grab at Christie's groin in the fixture at Ibrox but escaped retrospective action because the referee saw the incident at the time.
Celtic have claimed their own players were targeted with "sickening chants".