Sunderland full-back Phil Bardsley is poised to make his Scotland debut against Spain after manager Craig Levein confirmed Alan Hutton was a major doubt for the Euro 2012 qualifier.
Hutton has been struggling with a groin problem and was one of several players to sit out training on Sunday.
With Levein already without the injured Kirk Broadfoot, he confirmed that a debut for Bardsley was a "distinct possibility".
Levein said: "The biggest doubt is probably Alan Hutton. It looks as if he might struggle but I can't say for certain."
English-born Bardsley, 25, was called into the squad last week after pledging his allegiance to Scotland despite previously rejecting overtures from his Glaswegian father's nation.
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