There's no getting away from it, the challenge of the Brighton keeper on Luis Diaz is a red card.
It doesn’t matter whether the ball goes in the net or not, that’s a seriously bad challenge. You can go back to the Jordan Pickford challenge on Van Dijk last season, which was a bad one, and this Diaz one was even more reckless.
Diaz got very lucky because he could have easily damaged his cheekbone, his jaw or his eyes. It is serious foul play. Why don’t they allow the referees to go and look at these challenges? The VAR assistant should be dropped, in my opinion, it is that bad. I don’t necessarily think Sanchez has meant to hurt Diaz, but that is beside the point.