Graeme Morrison (ankle) and Glasgow apprentice John Barclay (groin) missed out due to injury while Jon Petrie is suffering from a virus.
Coach Matt Williams said he was not too worried by the fact that a total of 19 players could not take part in the full session: "All the players, with the exception of Iain Fullarton and Jon Petrie, are here today whether they're taking part or not, so they're still keeping in touch with all the drills we are running and exercises we're doing."