Hearts defender Callum Paterson has been called up to the Scotland squad as a replacement for the injured Phil Bardsley.
The 20-year-old right-back, who has also played up front during his career, has been an important player for Robbie Neilson's Championship leaders this season.
Paterson has now been promoted from the U21 squad, who face Switzerland, for the Celtic Park double header against the Republic of Ireland on Friday and England next Tuesday.