Aberdeen defender Ryan Jack will require surgery on a fractured foot and is expected to be out until the end of January, the club have confirmed.
The 20-year-old picked up the injury while captaining Scotland under-21s for the first time in Friday's 2-0 defeat by the United States in a challenge match in Spain.
A statement on Aberdeen's official website read: "Ryan Jack has this morning been to see a specialist to assess the foot injury he suffered while away with Scotland Under 21s.
"Following consultation it was confirmed the fracture will require surgical repair.
"Ryan is expected to be out until the end of January.
"Everyone at the club wishes Ryan a speedy recovery."