He then appeared before a Six Nations independent disciplinary committee which found him guilty of infringing Law 9.20(a).
Fagerson accepted that he had committed an act of foul play, but did not accept that it warranted a red card.
The disciplinary committee disagreed and suspended Fagerson for four weeks, ruling him out of Scotland's remaining three Six Nations matches against France, Ireland and Italy, and one further match to be determined.
Many observers viewed the punishment as harsh, noting the ban was longer than the one handed out to Ireland’s Peter O’Mahony who had been sent off against Wales in Cardiff in the first round of the Six Nations for a similar offence.
O’Mahony, who did not contest his red card at his disciplinary hearing, was suspended for only three games.
Fagerson has been supported in his case by Scotland coach Gregor Townsend and his appeal will be heard via video link today.
A statement from the Six Nations said: “The Scotland No. 3, Zander Fagerson has exercised his right to appeal the decision of the Six Nations Disciplinary Committee of 16.02.2021 to suspend him for four weeks for an infringement of Law 9.20(a).
“The appeal Hearing will take place by Video conference this afternoon.”