Kevin Nisbet has been called up to the Scotland squad with Hearts striker Lawrence Shankland forced to withdraw due to a slight hamstring issue.
The Aberdeen forward, who is on loan from English Championship side Millwall, becomes the third Dons player to be drafted in for the Nations League clashes with Croatia and Portugal.
Nicky Devlin was included in Steve Clarke’s initial squad with Jack McKenzie added this week.
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The national team lost their opening two Nations League fixtures and are looking to end the longest winless run in their history, with just one win – against Gibraltar - in their last 14 matches including friendlies.
Scotland face Croatia in Zagreb on Saturday before hosting Portugal at Hampden Park on Tuesday evening.
