Edinburgh winger Tim Visser will miss Scotland's three-day training camp through injury.
Visser, who injured his leg during Friday's 20-13 win against Treviso, will undergo an MRI scan later.
The 41-man squad gathered in Glasgow on Monday in preparation for next month's Autumn internationals.
Saracens back Duncan Taylor, who suffered an injury in his side's 41-20 Premiership loss to Northampton Saints on Saturday, is also absent.
Taylor suffered abdomen and shoulder damage and is being treated by Saracens' medical team.
Interim Scotland head coach Scott Johnson has named five uncapped players in his squad for next month's games against Japan, South Africa and Australia.
Scotland play Japan on 9 November and then South Africa on 17 November before meeting Australia on 23 November, with all three matches taking place at Murrayfield.