Keep it simple!

Perfect app. Does what is says, no more, no less.

Suggestions:
After making the sub, sort the players on the bench by time so we can easily see who has priority. You could use a background color for the player box to indicate priority if auto-positioning doesnt appeal to you.
Check out the app Paperless Lite - they have a nice GUI for adding to a their lists. Yours works fine, but could be easier.
Time in goal vs field position would be nice to have, but I wouldnt sacrifice simplicity.
Nice work!

dugloon about Coach's Clock