former Celtic defender pulled up with a serious-looking injury on the hour-mark as Scotland take on Switzerland.
The 27-year-old was pushed off the ball by Swiss striker Ndoye, who missed a golden chance to fire his country into a 2-1 lead.
And as Tierney struggled to keep his balance, the Arsenal player appeared to jar his leg, with his studs sticking in the turf.
He immediately signalled to the bench that he needed to come off, as he remained on the floor in clear discomfort.