Steve Clarke has called a quarter of young players up to train with Scotland before the squad heads off to the World Cuo.
Hearts duo James Wilson and Liam McFarlane, Dundee defender Luke Graham and Manchester United midfielder Tyler Fletcher will train with the squad at Lesser Hampden.
McFarlane will also travel to North America as a training goalkeeper.
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Clarke explained that while the call-ups will boost training numbers, it will also give him a chance to look at players who are on his radar.
“When I announced the squad, I made reference to a few young players joining us for training at Lesser Hampden,” he said. “It’s helpful for us, because it boosts our numbers for training – given the staggered arrivals of those who are still playing domestically – and it allows us to take a closer look at some boys who are on our radar.
“It should also be a very positive experience for the players themselves, who will get an insight into what we look for in the senior squad environment, surrounded by top professionals. Liam will meet up later in the week and will travel to America with the squad as a training goalkeeper.”
Scotland's World Cup squad was announced this week with striker Ross Stewart's inclusion the big talking point.