Celtic's Ryan Christie could be suspended after allegedly grabbing the groin area of Rangers' Alfredo Morelos during Sunday's Old Firm derby at Parkhead.

Christie has now been served with a notice of complaint by the Scottish Football Association for the incident in the 60th minute of the Gers' 2-1 Scottish Premiership win.

The Scotland midfielder could now be banned for two games, with Christie facing a disciplinary hearing on January 6.

The 24-year-old had already been booked when he appeared to make contact with Morelos after he had been nutmegged by the Colombia attacker, with only a foul awarded.

But Scottish football's rulebook allows for retrospective action if a potential red card offence was missed by the match referee.

Celtic were dismayed by the SFA's announcement, with the club saying on Tuesday: "We are absolutely astonished at this decision. Clearly we will defend Ryan vigorously."

Rangers' win over their arch-rivals and reigning Scottish champions cut Celtic's lead at the top of the table to the two points, with the Hoops having played a game more than the Gers heading into the league's winter break.