Colby Donovan has withdrawn from Scotland Under-21 duty just a day after completing the full 90 minutes for Celtic against Kilmarnock.

Donovan is one of two players to pull out of the squad, with replacements called up ahead of the international fixtures.

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No reason has yet been given for the Celtic defender’s withdrawal.

That makes the development one to watch from a Hoops perspective, particularly given how much football Donovan has played this season.

He completed Sunday’s 1-0 Premiership win over Kilmarnock at Celtic Park and there was no obvious indication during the game that he had suffered a problem.

#SCO21s | Squad update.

IN: Sam Chambers and Sebastian Lochhead.
OUT: Colby Donovan and Calum Adamson.

#YoungTeam

— Scotland National Team (@ScotlandNT) November 9, 2026

Donovan has become a regular option for Celtic during Alistair Johnston’s absence and has already made 21 appearances across all competitions this season.

His performances had also earned him recognition at international level.

Donovan was previously included in the Scotland senior setup before returning to the Under-21 squad for this month’s matches, where the expectation was that he would have the chance to pick up more game time.

That opportunity will now have to wait.

Scotland face Ukraine on Thursday before taking on the USA on Sunday, November 15, with both fixtures taking place in Spain.

The key question is whether Donovan’s withdrawal has any impact on his availability when domestic football resumes after the break.

At this stage, there has been no confirmation that an injury is behind the decision, so it would be premature to describe it as a fitness setback.

Given Donovan’s growing importance to Martin O’Neill’s side, though, any further update on why he has been removed from international duty will be worth keeping an eye on over the coming days.