Sure, but two of those three were brand new. Sanchez has been here 6 years.
Udogie actually came all the way across from left-back, leaving his man, in a desperate attempt to block. Van de Ven got close enough to get a block in.
Wissa was Sanchez's man. When the cutback came, Sanchez was nowhere in sight, having decided to stand on the touchline a yard away for reasons best known to himself. All he did was block Vicario's view of the cutback.
This is no surprise to me, it's what he does. But it is on him - as for that free kick, he still conceded it, still had to defend it - which he didn't.
As I said, he was okay apart from that. But you have to expect at least one stupid goal a game conceded because of him, and we cannot carry that after 6 years of him being here.
Edit: here's a picture which makes it even clearer:
View attachment 15850
I wish I had the one showing Sanchez completely failing to track his run, which was worse. But here is where he got himself at the end of it - nowhere close to Wissa, who had time to touch and slam home
That was his man.