Scotland will be without Zander Fagerson for the bulk of the Six Nations after the prop suffered a foot injury.
Fagerson's club Glasgow said the 21-year-old would be out for up to eight weeks after an accident in training.
Fagerson was an ever-present for Scotland in 2017 and has 15 caps for his country.
Scotland face Wales, France and England in February and Fagerson could also struggle to be fully fit in time to face Ireland on March 10.
Scotland travel to Italy for their last game on March 17.