Is that actually a rule or just a guideline? Lloris obviously played the next game after his collision with Lukaku so I'm not sure if it's enforceable or not?
There was a rule about it.
I remember when Paul Gerrard knocked out Abel Xavier and we officially confirmed that he had concussion so he couldn't play in the next game. We then played someone soon after who had a player similarly "knocked out" the week before but they only said that he'd banged his head so could play.
Not sure if that's still in place.
I think Lloris wasn't cleared by the doctors - the situation was muddied by AVB not taking him off in our game, then insisting he was fine. I'm sure if Spurs' doctors had said that he was ok for their next game he'd have been able to play.