Hopefully he’s ok and it was just being cautious. Boys had some bad luck and his form seems to be a lot to do with mental attitude. And of course this could affect him next header. Hope it works out for him, he deserves a bit of luck
From memory if you are diagnosed of suffering concussion you can’t play/train for 7 days after the incident and a doctor had to clear you to return to full contact training so he will be touch and go for Watford depends how quickly he’s cleared by doctors.