Glasgow Warriors hooker Pat MacArthur has been ruled out of the remainder of Scotland's tour of South Africa with a knee injury.
MacArthur, who lasted just minutes into his debut, is one of a number of internationals who picked up knocks in the 27-17 defeat to Samoa at the weekend.
"We have seen some 15 players for treatment following the game and, of these, four have significant injuries and two are subject to the concussion return to play protocol," physiotherapist Paul McGinley told the team's official website.
"In addition to Pat, our flanker Kelly Brown will be subject to on-going treatment for an ankle injury, while No 8 Johnnie Beattie and prop Geoff Cross have shoulder joint sprains.
"Stand-off Tom Heathcote and centre Alex Dunbar are both now on the concussion return to play protocol and a number of other players are carrying the sort of soft tissue injuries that arise from full-on Test match rugby."
The 26-year-old has been with Glasgow since 2007.
