Edinburgh hooker Neil Cochrane has joined up with the Scotland squad at Oriam as a replacement for the injured George Turner ahead of the Six Nations.
Turner, 25, sustained a medial knee ligament injury during Glasgow Warriors' 28-21 victory over Exeter Chiefs' on Saturday and will be out of action for eight weeks, ruling him out of the Six Nations which begins on February 3.
Cochrane, 34, will join Stuart McInally in Scotland's squad with Ross Ford and Fraser Brown both unavailable.
Lock Richie Gray will miss this week's three-day camp at Oriam with a calf complaint, as Scotland prepare to face Wales in their opening match in Cardiff.
Scotland's preparation has been disrupted by a series of front-row injuries.
As well as Ford and Brown, head coach Gregor Townsend will also be without injured tight-heads Zander Fagerson and WP Nel, while Simon Berghan is banned for the Cardiff encounter.
Loose-head trio Darryl Marfo, Allan Dell and Al Dickinson are also unavailable.