Five Celtic first-team players are away on senior international duty, and four of them have two Nations League matches during the November window. With the title race finely balanced, the fitness of the squad that returns for St Mirren matters.

Celtic stars Kieran Tierney, Liam Scales, and Viljami Sinisalo are each set to play two UEFA Nations League fixtures during the November international window. They are among five senior Celtic first-team players called up, alongside Benjamin Nygren for Sweden and Auston Trusty for the USA, who faces Haiti. Celtic will monitor minutes and travel ahead of their Scottish Premiership match against St Mirren on November 21, 2026.
Meanwhile, injury concerns have already impacted Celtic's youth internationals. Colby Donovan withdrew from the Scotland Under-21 squad to rest following 21 club appearances this season, while Mika Baur's ankle injury caused him to miss joining Germany's Under-21 squad.
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