Going back to Saturday’s game, as someone who runs the line myself they were 3 of the worst decisions I have seen from a linesman in a long time.
The first one wasn’t even close, Mata was marginal but if you’re looking down that line they clearly offside & then he didn’t flag following Mata’s shot when 2 Chelsea players were clearly offside & impeding Al Habsi in his attempts to make what should have been a comfortable save