They need to put a video of the lack of drive/anticipation with the spilled shot on repeat for him. Think it was maybe after that, around the 74th minute, something else happened and he was just walking with his head down. Then show him videos of him from a couple years ago, show him the workrate and effort he put in even when game was not going well. He could be having a horrible game but, because he kept his head up, kept working, often would come up with an assist or goal.
Needs to get the basics of hard work and right mental attitude on the pitch first, fix that and his form will pick up. Without it, might as well pack up and go home.