Ralf Rangnick's reaction to Arsenal's opener spotted as De Gea goes down after contact with Fred

Manchester United conceded the first goal against Arsenal on Thursday in a truly bizarre fashion.

Fred stood on David De Gea's foot in the Man United box and the Spaniard fell to the ground, writhing in pain after.

Emile Smith Rowe then scored the opener for the Gunners while the goalkeeper was down, and the goal stood after a VAR check.

Ralf Rangnick, who was sitting in the directors' box, was spotted writing something down right after the incident with a concerned look on his face.