Manchester United midfielder Scott McTominay was one of six players handed their first Scotland call-ups as manager Alex McLeish named the first squad of his second spell in charge.
McTominay, Barnsley striker Oli McBurnie, Wolves left-back Barry Douglas, Hearts goalkeeper Jon McLaughlin, Hibernian midfielder Dylan McGeouch and Aberdeen defender Scott McKenna have all been included for the friendlies against Costa Rica and Hungary later this month.
Three more uncapped players are in the squad: Millwall goalkeeper Jordan Archer, Fulham midfielder Kevin McDonald and Rangers winger Jamie Murphy.
McLeish was unable to select a number of experienced players through injury, including Craig Gordon, James Morrison, Barry Bannan and Steven Fletcher, but others have failed to make the pool, including Robert Snodgrass and Darren Fletcher.
"It is a fresh start," McLeish said. "There's couple of the experienced players not in the squad but I know what they can do. I want to have a look at some other players.
"It's a couple of friendly games. It doesn't mean we will play friendly, but I certainly want to look at players who have been doing well for their clubs. We want them to play the way they have been playing for their clubs and try [to] challenge themselves to become even better."
McLeish confirmed McGeouch made a "late run" into the squad after watching him shine in Hibernian's victory over Hearts on Friday.
"The next step is the guys [must] prove it," he said. "They have to now show they can live with other international teams, improve their game and see if they can raise the bar to the highest level they can possibly go."