Edinburgh's Hamish Watson has also joined the squad.
Centre Alex Dunbar sustained a mild posterior thigh strain as Warriors beat Racing 92 on Saturday, requiring ongoing assessment and treatment.
Fellow Glasgow centre Mark Bennett continues to make good progress on the shoulder injury he sustained earlier this month.
The Glasgow prop has one Test cap to his name, having made his international debut against the USA in the summer of 2014.
Scotland's Six Nations campaign begins against England on Saturday, 6 February.