Scotland captain Andrew Robertson suffered a serious-looking shoulder injury during the Euro 2024 qualifier against Spain.
The Liverpool left-back, 29, had to leave the pitch before the break in Seville with his arm cradled in his shirt after a challenge with Spain goalkeeper Unai Simon.
Robertson was replaced by Everton's Nathan Patterson.
The defender looked in discomfort as he left the pitch.
Scotland need a draw in Spain to clinch qualification for Euro 2024 and next face France in a friendly on Tuesday.
Robertson looks set to miss that match and could sit out Liverpool's derby with Everton on 21 October.