Ball-watching is a bad midfield habit to have. It can distort a team’s whole defensive structure.Gallagher should recognise Jorginho has tracked the overlap,then cut the lane off to Rodri. He doesn’t so Kovačić gets dragged across which leaves space for Walker to assist the goal.
Not sure what’s going on at Chelsea, but that defeat is as bad as you will see a team organised off-the-ball. Players just running aimlessly without a sense of direction or how to keep the shape compact.