I think the rule should be that if a player is knocked out he is brought off straight away regardless of how he feels when he comes round.

Having said that, he did come round and I am sure the spurs staff would have asked all the correct questions such as the Maddox questions and given a good assessment which Lloris obviously passed, I don't think the staff would have played him if he wasn't sure what day it was and was hallucinating. Isn't the point of having these questions / questionnaires so people can pass or fail them, and if they pass, why shouldn't they play?