The Scot revealed after the 2-1 win that he played most of the first half partially sighted after Neymar accidentally caught him in the face and dislodged his lens.
Ahead of our second group game, at home to RB Leipzig, McTominay is hoping to stay fully focused - literally - throughout the 90 minutes.
“I got one in the face in training this week and I was like 'oh no here we go again!'” he joked. “It's amazing how they can stay in by getting a ball right in your eye. Your eye starts watering but they still stay in.