Scott McTominay sat out Scotland training on Thursday as Steve Clarke continued his preparations for Sunday’s World Cup opener against Haiti.
The 29-year-old Napoli midfielder was conspicuous by his absence at the Atrium Heath Training Centre in Charlotte, North Carolina after going down with a stomach complaint.
Dinamo Zagreb defender Scott McKenna, also 29, was another absentee as he nursed a knock.
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However, both men are expected to be fit as the Scots get their Group C campaign under way in Boston during the early hours of Sunday morning.
Scotland will head into the game looking for a fast start to the competition with Morocco, who made the semi-finals in Qatar four years ago, and five-times winners Brazil waiting in the wings.