Craig Levein has added uncapped duo Paul Dixon and Gary MacKenzie into his Scotland squad ahead of their opening World Cup qualifiers against Serbia and Macedonia later this month.

Huddersfield Town left-back Dixon, 25, will replace Southampton's Danny Fox, who has picked up a groin injury.

Meanwhile, Gary MacKenzie, 26, of MK Dons comes in for Russell Martin to provide cover in central defence, after the Norwich City centre-half aggravated his groin in training.

Updated squad

Goalkeepers: Matt Gilks (Blackpool), Allan McGregor (Besiktas), David Marshall (Cardiff City)

Defenders: Christophe Berra (Wolverhampton Wanderers), Gary Caldwell (Wigan Athletic), Paul Dixon (Huddersfield Town), Grant Hanley (Blackburn Rovers), Alan Hutton (Aston Villa), Gary MacKenzie (MK Dons), Charlie Mulgrew (Celtic), Andy Webster (Heart of Midlothian)

Midfielders: Charlie Adam (Stoke City), Don Cowie (Cardiff City), Graham Dorrans (West Bromwich Albion), James Forrest (Celtic), Shaun Maloney (Wigan Athletic), James Morrison (West Bromwich Albion), Matt Phillips (Blackpool), Robert Snodgrass (Norwich City)

Forwards: Ross McCormack (Leeds United), Jamie Mackie (Queens Park Rangers), Kenny Miller (Vancouver Whitecaps), Steven Naismith (Everton), Jordan Rhodes (Blackburn Rovers)