I'm not entirely convinced that would happen. Wandering round chatting to folk now and again at the various tracks I go to during a season, I've discovered very few actually know the team situation at a given match before arriving at the track. To even know about changes you have to be on this forum, read the SS (and that won't tell you if the injury or whatever is quite recent), read the local press or the team's web-site. Quite a few of those I see don't do any of those, they just make up their minds to go to a match and they go. I've even come across those that will go to a match when the visitors are light, more chance of a win.