The Spanish goalkeeper is at home watching the game as Sergio Romero takes his place as the club’s Cup goalie.
So de Gea was in a good position to see all of the TV coverage of the Mata goal, which was initially ruled good before VAR overturned the decision of the linesman.
Now it's Graham Poll's turn to have a look at Juan Mata's "goal"…
And even VAR's biggest fan can't support the decision ? pic.twitter.com/M12VpdEUAU
— Football on BT Sport (@btsportfootball) February 17, 2018
In BT Sport’s coverage, crooked lines appeared as part of the VAR replay – and that’s led to a lot of criticism for the new concept in football.
It’s since been confirmed that straight lines were used by the video referee, but, even with those, it’s not absolutely clear that Mata is offside.
And, just like the rest of us, de Gea was very confused:
— David de Gea (@D_DeGea) February 17, 2018
I think we can get exactly what he’s thinking from that one emoji.
The video referee may now be hoping that United can go on and get a few more goals so the controversial decision isn’t as significant by the end of the match.
However, you’d expect the debate to rage over VAR after the game, calling into question whether or not it’s ready for competitive football yet.