How many members you have? Try to work on your management... Do
they want to play for the team...?
From what I see, going out with friends and forgetting PE shirts
are pretty lousy excuses...
Take the initiative to REMIND them (especially those who always
forget) a day before training day...
Try to plan the schedules way before time, and if possible... On a
more routine basis... Ask them to decide for themselves which is
more important... Training for the team or going out with
friends..? Make a CLEAR SIMPLE statement... How well they value the
team (trainings) would be how well the team would value them
later...
Try to separate out (blacklist?) the insincere ones from the
sincere ones...
Take attendance... Use them as backup for your decision of playing
team members selection later... If your sports rep try to override
you, try to bring to higher authority if you think your decision is
valid... If the playing team members combination is way beyond your
'idea'... Make clear to the class or whoever is blaming you before
the games that this is NOT your decision but more of an INSIST TAKE
of your SPORTS REP...
Last but not least... Try to better your relationship with your
sports rep...?