Cameron Bell, Don Cowie and Kevin McNaughton have been drafted into the Scotland squad ahead of the upcoming Euro 2012 qualifiers.
Craig Levein's side has been hit by injuries as they prepare to take on the Czech Republic and Spain.
Kilmarnock goalkeeper Bell, called up for the first time, steps in for Matt Gilks, who was sent back to Blackpool on Monday afternoon after failing to overcome a dead leg.
Rangers keeper Allan McGregor is set to undergo a scan on a niggling thigh injury but is reportedly not a doubt for Friday's game in Prague.
Ibrox defender Kirk Broadfoot, however, departed the Scotland camp on Monday due to a foot problem, with Cardiff full-back McNaughton taking his place.
And although Lee McCulloch is unavailable for the first game through suspension, he is also carrying a hip injury, which led to Levein calling up Watford midfielder Cowie.
Scotland currently sit top of qualifying Group I having collected four points from their opening matches against Lithuania and Liechtenstein.
After taking on the Czech Republic this week, they will host World Cup winners Spain at Hampden Park next Tuesday.