Interesting bigger question on this. Does football have head impact policies in place. Watched couple of head collisions between Nigeria players during the friendly at the weekend. I know they are different sports with different levels of impact but most head to head collisions in rugby would result in both players being taken off the pitch for a 10 minute assessment with reserves being allowed to take their place whilst this goes on. Maybe it is time for football to do the same.
That said, if the concussion was such that it impacted on a players ability then the player should have realised that something was not right.
I remember the Nigerian lads collision, it looked bad. You would have to assume that policies are not in place, certainly not ones that are as stringent as in rugby. Clubs may have their own way of dealing with it but it does not look like football has an industry wide standard in the way that rugby has introduced. It will come, what happens in rugby makes a great deal of sense. Football tends to be years behind other sports on rule changes and the like though.
I think it has been long established that players are not good judges of their own injuries when it comes to concussion. That is why it needs to be taken out of their hands.