Yes indeed that could be an issue - but if a doctor has signed it off, the player wants to play, then unless the club itself has a doctor who the player presented to on the day, they are in the clear. Some clubs I am sure will tell the player "don't be ridiculous, and give us the name of your doctor" but bottom line is once a doctor signs away to say clear to play then that's that. Goes for all medical situations in life, not sure why local community AFL footy is any different.The extremely challenging position for clubs / AFLQ to manage is the player who had all the signs or symptoms of a concussion, yet presents to training with a letter from a doctor saying the player has no symptoms of having incurred a concussive event and therefore is medically cleared to play! Very challenging for a club to say to a player we are overriding a doctors professional assessment and not allowing you to play the next two games!