Scotland will play the Republic of Ireland and the Ukraine in the Nations League.
Uncapped left-back Doig and centre-half Gallagher have been called up.
He was hurt in the first half of the game against the Ukranians.
Scotland leads the group by two points.
A place among the second seeds for next month's Euro 2024 qualification draw is dependent on two draws.
Doig played the entire 90 minutes for Scotland under-21s in a win over Northern Ireland on Thursday.
In June 2021, he won his last cap.
Scotland are without their captain Andy Robertson, as well as defenders Liam Cooper and Grant Hanley, and forward Jacob Brown.
McLaughlin had been replaced by Robby McCrorie before the game.
All Rights Reserved © 2024
