Kieran Tierney could not hide his shock after an opponent somehow avoided a yellow card for tearing off part of his shirt on Thursday night.
The Arsenal left back scored the only goal as his side beat FC Zurich 1-0 in their final Europa League group game, securing them top spot in Group A and a more favourable draw for the knockout stages.
But the Scot was left stunned as Zurich right back Nikola Boranijasevic escaped a booking despite ripping a huge chunk out of his shirt as he pulled Tierney back.