Scotland coach Frank Hadden said he was encouraged by the progress being made by Glasgow captain Al Kellock, who missed the last two and a half months of the season with a knee injury.
"Al Kellock seems to be coming through fine but we have to keep a close eye on him. He had a double session today and it will be interesting to see how he is tomorrow," he said.
Glasgow Warriors are well represented in the squad - including Thom and Max Evans - the latest set of brothers in line to make an impact at international level.