Alex and Duncan have signed deal with Glasgow Warriors for next season. They are joined by West of Scotland's Robert Harley who is also expected to sign for the Warriors on a pro terms for next season.
The young Scots side will face 2009 semi-finalists Australia and South Africa before taking on Tonga in a repeat of the side's 28-25 ninth-place playoff victory over the South-Sea Islanders in last season's championship.
Scotland U20
Forwards
David Denton (Edinburgh Accies)*, Michael Fedo (Watsonians), Adam Fedorciow (University of Bath), Grant Gilchrist (Stirling County)*, Robert Harley (West of Scotland)*, George Hunter (Glasgow Hawks), Anthony Kent (London Scottish), Nicky Little (Hawick)*, Robert McAlpine (West of Scotland)**, Michael Maltman (Heriot's)**, Stuart McInally (Watsonians)*, Colin Philips (Stewart's Melville)**, Calum Stidston-Nott (London Scottish), Alun Walker (Currie)
Backs
Alex Black (Leeds Carnegie), Tom Brown (Edinburgh Accies)*, Alex Dunbar (Selkirk)*, Dougie Fife (Currie)**, Oliver Grove (Worcester Warriors), James Johnstone (Currie)*, Jonny Kennedy (Sale Sharks), Callum MacBurnie (Moseley), Matthew Scott (Currie)**, Michael Tait (Newcastle Falcons), Duncan Weir (Glasgow Hawks)*, Russell Weir (Loughborough Students)
* Denotes a member of the Scottish National Contracted Academy
** Denotes a member of the Scottish Rugby National Academy supported by the Scottish Institute of Sport
Saturday 5 June - Australia v Scotland, Estadio CA Colon, Santa Fe
Wednesday 9 June - South Africa v Scotland, Estadio CA Colon, Santa Fe
Sunday 13 June - Scotland v Tonga, Club Atletico Estudiantes, Parana