Jon Welsh has been ruled out of the remaining two matches of Scotland's tour of the South Pacific through injury and will be replaced by his Glasgow Warriors club-mate Moray Low.
Prop Welsh, 25, who won his sole cap to date against Italy in the final game of this year's Six Nations, suffered a recurrence of a shoulder problem during training in Sydney.
"Jon has had problems with his shoulder and today during a relatively innocuous tackle technique exercise he sustained a shoulder subluxation, where the shoulder partially dislocated from the joint," said Scotland team doctor James Robson.
"We were able to put it back in but I believed it was appropriate care for Jon to be scanned and the scan showed that the shoulder had sustained damage incompatible with the demands of international rugby and sadly he will take no further part in the tour.
"He will be reassessed on his return home with a view to possible surgery."
Scotland head coach Andy Robinson added: "We are all disappointed for Jon who has trained well and been a popular member of the squad. We wish him a speedy recovery.
"We are now making arrangements for Moray to fly out and he will join us in Fiji early next week."
Low, 27, who won the last of his 15 caps in the EMC Test against Italy last year, has fought back from injury this season to be part of the Glasgow squad that reached the semi-finals of the RaboDirect PRO12.
Meanwhile, flanker Alasdair Strokosch has returned to team training following a head wound, while back Joe Ansbro (head wound) did not train but showed visible signs of improvement as the swelling receded around his eye.