Thinking about it I didn’t hear any booing aimed at Bissouma, so I’m sure the booing was for Richarlison when he came on.
Surely if people wanted to boo Biss they would have done it as soon as he touched the ball.
As a rule I usually know who is coming on as a sub before I know who is going off, unless the player coming off is clearly injured.
Probably because I’m near the front of the WSU and I can see the sub coming on standing near the 4th official.
When I saw Richarlison warming up I did expect him to...