I haven't really posted about it or followed the story much (not being on Twitter, Instagram, etc).
Did he reappear to sit on the bench for the second half? If so, that certainly suggests it wasn't a strop and he was just changing his wet shirt. If not, that needs further explaining why he didn't reappear with a dry shirt.
Having just looked up Amorim's quote, he seemed to suggest he'd speak with Garnacho about it after the game. Which seems strange if he could have just said: 'Nothing to it. He was just changing his wet shirt and sat on the bench all the second half supporting the team'. His response seems to suggest there was maybe more to find out and be explained about the situation, but hopefully not. We desperately can't afford to have another key player falling out with the manager and being disciplined. Our squad is stretched enough as it is.