Ross McCormack has withdrawn from the Scotland squad for the friendly match against Estonia. The 26-year-old stricker is suffering from a respiratory illness and said on Twitter: ''Gutted to be pulling out the Scotland squad ill''.
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Gary Caldwell missed the first two days of training while Scott Brown attended Tuesday's session without taking part. The match in Aberdeen is Gordon Strachan's first since taking over as Scotland manager.
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Lee Wallace, Chris Burke, James Forrest and Phil Bardsley all return for the home team while Estonia's squad features Motherwell's Henrik Ojamaa.
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Rangers left-back Wallace, who has been playing in Scottish Division Three this season, and Sunderland defender Bardsley were last capped in a 5-1 friendly defeat by USA in May.