Add "Selected for squad" status
In larger teams, the coach needs to select a squad before each game from the players who marked themselves as "Coming".
In our case, some games are quite far away, so it wouldn't make sense for all available players to do the trip only to find out they haven't been selected for the squad this time. The squad changes every week, based on player availability, player performance and opponents. At the moment, our players are told to keep their status as "Maybe" if they are available, for the coach to mark them "Coming" if they have been chosen for the squad or "Rostered off" if they haven't. However, this doesn't apply to trainings, where the players need to mark themselves "Coming" or "Not Coming" It's quite messy and has led to some confusion in the past.

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info commented
The current options of available, no reply and unavailable do not assist coaches in confirming who from the available list is actually going to play a part in a match day squad. The only work around is to roster off players so far in advance with the hope that those not rostered off will be available. The app needs to gave an adaptive (customised) feature that allows clubs to create alternative options. Currently to generic.