Weir and Gilks in the squad...
The national team's goalkeeping coach Jim Stewart is thought to have had an eye on the performances put in by Blackpool goalkeeper Matt Gilks for some time now, as the shot-stopper has been given a look in despite conceding six times against Arsenal recently.
In the meantime, defensive concerns have also led to the former Dundee United boss calling-up veteran Rangers centre-half David Weir for the first two qualifying games.
The full squad is as follows:
Goalkeepers: Matt Gilks (Blackpool), David Marshall (Cardiff City), Allan McGregor (Rangers)
Defenders: Christophe Berra (Wolves), Alan Hutton (Tottenham Hotspur), Stephen McManus (Middlesbrough), Kevin McNaughton (Cardiff City), Lee Wallace (Heart of Midlothian), Andy Webster (Rangers), David Weir (Rangers), Steven Whittaker (Rangers)
Midfielders: Charlie Adam (Blackpool), Kirk Broadfoot (Rangers), Scott Brown (Celtic), Graham Dorrans (West Bromwich Albion), Darren Fletcher (Manchester United), Paul Hartley (Aberdeen), James Morrison (West Bromwich Albion), Steven Naismith (Rangers), Barry Robson (Middlesbrough)
Forwards: Kris Boyd (Middlesbrough), Steven Fletcher (Wolves), Chris Iwelumo (Burnley), Lee McCulloch (Rangers), James McFadden (Birmingham City), Kenny Miller (Rangers)
Fletcher, Hutton and McNaughton are currently doubtful for the game against Liechtenstein, but could become available if they should regain fitness.