Scotland head coach Alex McLeish has called up seven uncapped players for end-of-season friendlies against Peru and Mexico.
They are Hearts’ John Souttar and Jon McLaughlin, Hibs’ Lewis Stevenson and Dylan McGeouch, Aberdeen’s Graham Shinnie, Celtic’s Lewis Morgan and Millwall goalkeeper Jordan Archer.
Former Dundee United and Derby striker Johnny Russell, now with Sporting Kansas City, is also included.
Five Celtic players will not travel.
Craig Gordon, Kieran Tierney, James Forrest, Callum McGregor and Leigh Griffiths are all left out to help them recover from a heavy domestic season, but Jack Hendry, Stuart Armstrong, Ryan Christie and Morgan are included.
Liverpool full-back Andrew Robertson – who should feature in the Champions League final against Real Madrid on 26 May – will also miss the trip to South and Central America.
Scotland travel to face Peru on 29 May, followed by Mexico on 2 June. Both countries will be using the matches as preparation for competing at the World Cup in Russia starting on 14 June.
Russell, 28, made his Scotland debut as a substitute against England in November 2014 and has won four caps in all.
Hibs full-back Stevenson, 30, has been capped at Under-19 and Under-21 level, but never for the senior side.
His club-mate McGeouch, who is leaving Easter Road this summer, was selected for McLeish’s original squad for the first games of his second stint in charge against Costa Rica and Hungary in March, but was forced to pull out injured.
Celtic-bound winger Morgan, 21, was named PFA Scotland Championship player of the year after helping St Mirren to promotion.
Aberdeen captain Shinnie, plus goalkeepers McLaughlin and Archer, have been in previous squads but have yet to make their debuts.
Of those McLeish selected in March, Norwich centre-backs Grant Hanley and Russell Martin (the latter on loan at Rangers), Fulham midfielders Tom Cairney and Kevin McDonald, and striker Jason Cummings – on loan at Rangers from Nottingham Forest – have been left out.
Scotland lost 1-0 at home to Costa Rica at Hampden before beating Hungary 1-0 in Budapest four days later.
They face a final warm-up match against Belgium in September before facing Albania and Israel in the inaugural Nations League.
Goalkeepers: Jordan Archer (Millwall), Allan McGregor (Hull City) Jon McLaughlin (Hearts)
Defenders: Barry Douglas (Wolves), Jack Hendry (Celtic), Scott McKenna (Aberdeen), Charlie Mulgrew (Blackburn Rovers), Callum Paterson (Cardiff City), John Souttar (Hearts), Lewis Stevenson (Hibernian).
Midfielders: Stuart Armstrong (Celtic), Ryan Fraser (Bournemouth), Dylan McGeouch (Hibernian), John McGinn (Hibernian), Kenny McLean (Aberdeen), Scott McTominay (Manchester United), Jamie Murphy (Brighton & Hove Albion, on loan at Rangers), Matt Ritchie (Newcastle United), Graeme Shinnie (Aberdeen), Ryan Christie (Celtic, on loan at Aberdeen)
Forwards: Oli McBurnie (Swansea City, on loan at Barnsley), Lewis Morgan (Celtic, on loan at St Mirren), Matt Phillips (West Bromwich Albion), Johnny Russell (Sporting Kansas City).