Nathan Patterson will not be available for Scotland's World Cup playoff clash with Ukraine on Wednesday.
The Everton full-back was called up to the camp for the crucial fixture having missed the end of the season due to surgery on an ankle problem.
Patterson arrived at Goodison Park in January in a signing that excited supporters, although he has yet to play a minute in the Premier League for the Toffees. In his only start - the FA Cup clash with Boreham Wood - he was withdrawn at half time.