Manchester United's Tyler Fletcher, 19, has been named as Gilmour's replacement in the squad.
Scotland's World Cup journey begins
Scotland have qualified for the World Cup finals for the first time since 1998. Head coach Steve Clarke led the squad out of Glasgow for the United States on Sunday, with a final warm-up friendly against Bolivia scheduled for Saturday in New Jersey.
Scotland open their Group C campaign against Haiti on Sunday, 14 June, before facing Morocco and Brazil.


