Scots sweat over injuries
Scotland have serious injury problems to deal with in the wake of their narrow 19-17 win over Canada.
The Scots head to Argentina and then on to South Africa, but will do so with a number of players heading back home.
Kelly Brown and Alasdair Strokosch would have been barred by their clubs from playing against the Pumas anyway, but their problems mean they will be flying back.
Brown has a torn bicep and Strokosch has a neck problem, which has not turned out to be as bad as was first feared when he required lengthy treatment on the field and was submitted to hospital.
They join Ruaridh Jackson (concussion) and Johnnie Beattie (knee) in returning home, with that duo being replaced by Kieran Low and Blair Cowan. Those two will be barred from facing Argentina by London Irish, though.
As a result Cotter has serious problems ahead of him on a day when his two parties came together. Those who have been on tour have been joined by those who have been training at Murrayfield under assistant coaches Jonathan Humphreys and Duncan Hodge.
The incomers join a squad not entirely satisfied despite winning both of its games on tour so far.
"We have got to take confidence form the fact that we have played poorly and won," said Grant Gilchrist, the lock who started last week's Test and one of those staying for the whole four games.
"We played way below our standards but have come away with two wins and have to take that forwards.
"We know what a massive challenge Argentina are going to be. The new group and the old one have to gel quickly and deliver a performance on Friday.
"The final result is the only thing that matters at the end of the day. It is fair to say that all the coaches and management will be annoyed at how things have gone and the performances but we have to take positives from playing a good Canada side, not playing at our best but still coming away with the win.
"In the next game we have to execute well and produce a performance of a much higher standard than us."