Kieran Tierney withdraws from Scotland squad due to injury

Kieran Tierney has withrdawn from the Scotland squad after sustaining a head injury in the Nations League game against the Republic of Ireland.

The 25-year-old was subbed off as a precaution before half-time after a nasty tussle with Troy Parrott.

The left-back has already returned to Arsenal, the club's official website confirms.

This suggests that the problem is a bit more serious than it appeared during the game, but Tierney will likely undergo an examination with his club to determine its extent.