What should I say to my football coach?

Personally, I do not believe that you need to say anything to your football coach. Remember, the best way to prove yourself is through actions, not words.

My best advice for you is to work hard and perform very well in practice every day. In addition, what you need to do this summer (and every offseason) is eat healthy, exercise by doing weight lifting, and either jogging or going for a long run every day. If you do these things, you will get faster, stronger, and into better shape, which will greatly improve your chances of becoming a successful, top notch football player.

Tell him you grew a pair and would like a second chance.

tell that fool, that foot ball is what you fools call soccer in this territory and that real football is what barcelona plays.