With Blair on the bench and Cusiter absent, Glasgow lock Alastair Kellock will captain the side.
BBC: Rory Lawson earns start for Scotland for Argentina Test
Alastair Kellock will continue as skipper, while scrum-half Rory Lawson again starts ahead of Mike Blair.
Gray and Vernon, both of Glasgow Warriors, come in for the injured Ally Kellock and Johnnie Beattie.
BBC: Scotland add Greig Laidlaw to squad for All Blacks game
Then two minutes from the break Kellock was punished for tackling Samson early at the scrum base.
Robinson praised Kellock for his recent displays for Scotland and said he expected him to lead by example.
BBC: Rory Lawson earns start for Scotland for Argentina Test
Al Kellock will miss the first of their three autumn Tests through injury.
If Kellock and Cusiter miss out, head coach Andy Robinson will need to select a new skipper, with Mike Blair among the likely contenders.
"The fact that we went down there and got a win will give us a bit of confidence, " skipper Alastair Kellock told BBC Sport.
Kellock had just returned when Glasgow scored their second unconverted try.
Glasgow captain Kellock will lead Scotland out for the first time in his career and Robinson is sure the powerful lock will rise to the occasion.
BBC: Rory Lawson earns start for Scotland for Argentina Test
Lock Kellock, who led Scotland to an historic first series win in Argentina in June, has had a knee operation and will miss the start of the season.
Glasgow backs Dan Parks and Andy Henderson and the forward trio of Ross Ford (Borders), Alastair Kellock (Glasgow) and Simon Taylor (Edinburgh) have been added to Scotland's squad.
Yet again, ref Jones was in the spotlight when he ignored a late challenge on Parks - and handed Munster a penalty when Glasgow skipper Ally Kellock complained.
Glasgow skipper Al Kellock has recently returned from a long injury lay-off and played for Scotland A on Friday but the Samoa game may come too soon for him.
The Stade Francais number eight is added to Saturday's 22, along with Rob Dewey, Max Evans, Mark Robertson, Nikki Walker, Simon Webster, Kelly Brown, Geoff Cross, Alastair Kellock and Alasdair Strokosch.
Robinson not only has to decide who will play second row in Kellock's absence but who will take over his role as captain, but the coach was playing his cards close to his chest.
Cusiter has not played since injuring his knee in Glasgow's final regular league game in May and is almost certain to miss the November Tests, while Kellock may have a chance of recovering in time to play some part.
Glasgow, having used all their replacements, suffered a further set-back when Forrester was carried off on a stretcher, followed by limping skipper Alastair Kellock, and the 13 men left were unable to prevent the Blues claiming a bonus point as Mustoe galloped over from 50 metres.
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