Grant Hanley is set to miss Scotland’s Euro 2020 double-header with Russia and Belgium.
The Norwich star has a groin injury, leaving Steve Clarke with just Charlie Mulgrew and Liam Cooper in central defence.
The Scotland boss could decide to call up someone such as Sheffield Wednesday defender David Bates who has been in past squads.
It could even be an opportunity to hand a maiden call-up to highly-rated Hearts centre back Craig Halkett.
Meanwhile, James Morrison insists he'll never give up on playing for Scotland is also determined to claim three extra caps.
Many people believe he has 46 but Morrison is insistent he has more than that.
He said: “I saw Frank Reilly at Snoddy’s wedding and he said I had 49 caps. I’ve been saying this to people for ages and no-one believes me. I’ll need to count it!”
“I’d never give up playing for Scotland. I loved it. If I get playing and I get picked, I’d be over the moon.”
