The Rangers midfielder sustained an ankle injury in Sunday's Old Firm derby win over Celtic at Ibrox while Birmingham ace McFadden reported with a groin strain.
Manchester United star Darren Fletcher has a tight hamstring but will train on Tuesday while Dundee United defender Andy Webster will shrug off his calf injury to train today.
Doubtful duo: McCulloch and McFadden (R) could both miss out for Scotland
Scotland manager Craig Levein has no plans to add to his 24-man squad.
Levein's assistant, Peter Houston, claimed Celtic skipper Scott Brown was in fine fettle when he joined up with his Scotland team-mates despite being controversially sent off against Rangers in the 1-0 defeat.
Houston said: 'He was in great form. He had a bit of banter but that's Scotty for you.
'Half the squad will be training today, half will be doing a recovery session.'
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