Days before a game? An individual can get infected 5 minutes before they pull into an arena parking lot. Testing will have to be immediately before the game, and that will be problematic, since anyone getting tested at the arena will be exposed to the virus if they were in close proximity with a fan getting tested before the game as well who was positive but didnt know yet
If someone is exposed 5 minutes before the game they would not be contagious. It would be best to get tested two-three days before a game as there is an incubation period before they become contagious.