Concussion and cervical injuries share a lot of similar symptoms. Also, he seemed to get worse after a little time passed. They're just taking every precaution until they can get him properly checked out. Putting the neck brace on in case it's a cervical injury.
Solskjaer needs to get sent to the stands at the half, berating Mike Dean the whole way down the tunnel. Penalty not given, nobody in the book when they have consistently fouled, it's ridiculous