Rangers kid Aiden McCallion joined in Scotland training to help up the numbers on Monday.
The Ibrox youngster, 16, was spotted training with the Scotland A team at Lesser Hampden.
McCallion, who is not 17 until June, is part of the Scotland under-17 national team.
The youth side faces North Macedonia and Romania in UEFA EURO qualifiers during the international break.
However, McCallion joined in with Clarke's side for training at Lesser Hampden in an effort to increase numbers for the first day of the camp.
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Snaps from the session show McCallion taking part in the warm-up with Scotland.
According to the Daily Record, McCallion is one of four youngsters involved in Clarke's session on Monday.
Hearts' Alfie Osbourne, Aberdeen forward Fletcher Boyd and Ayr United's Jamie Hislp - all in the under-17 side - were involved in training this morning.
It's thought the teenagers were moved up to help boost numbers while also giving them experience at the top level.
