Manchester United youngster Tyler Fletcher has been called up to Scotland's squad for the World Cup as a last-minute replacement for the injured Billy Gilmour. Fletcher, 19, only made his senior debut for Scotland on Saturday in their 4-1 friendly win against Curacao, during which Gilmour picked up a knee injury . The Napoli star will now miss the World Cup, where Scotland will appear for the first since 1998, in a devastating blow. Steve Clarke's squad are due to fly to the United States on