Scotland coach Frank Hadden admitted that skipper Jason White's knee injury picked up in the 48-6 victory over Romania on Saturday could be serious.
The Scots ran in seven tries in the first of their November Tests but White could miss the rest of the autumn series.
"Jason has had an initial assessment and he will be getting a scan on Monday morning [today] so we really won't know until then," Hadden said.
"The injury happened when he got his studs caught in the turf leaving a scrum and he twisted awkwardly. There was no-one involved in a contact situation," he said.
"He's feeling a bit foolish and a bit sore and we're keeping our fingers crossed that it is not serious. It was obviously serious enough for him to come off and it was difficult for him to bear any weight on it," Hadden said. "It doesn't look a good sign but we'll just have to wait and see and we won't know any more until Monday."
With top back-row men Ally Hogg and Donnie Macfadyen also on the casualty list and Simon Taylor still to prove himself fit to return at this level, the departure of White was the last thing Hadden wanted to see.
But on the positive front, it was rookie No. 8 Johnny Beattie who sparked the Scots' success with the opening try.
And the other debut starter, center Rob Dewey, followed suit just after the interval to snuff out the Romanian challenge.
"We are now at the top table of international rugby -- and we deserve to be there," Hadden said.