Welcome to the forum, Arsenal. I hope you find your answers here. I hope you will do some searches in the search box at the top of the page, also read the general info on the locked pages.
I find that I have a permanently smaller stomach, although some people have stretched theirs out after surgery. Since a Nissen, and the other surgeries where "wraps" are performed, make the stomach smaller, your stomach will not hold as much as it used to. That's great for people who are overweight. The rest of us just need to eat more often. I never lost any weight after surgery - just ate a little every hour or two. Now I eat what feels comfortable, not as much by half as I used to eat, whenever I am hungry and have no problems with weight, never feel ravenous. The feeling of hunger remains the same.
If you overeat you will probably feel full, or bloated and nauseous, no mysterious symptoms you haven't felt before. You can feel like you had thanksgiving dinner eating 2 cups of food even a month or two after surgery. For soccer you might want to carry a nutritional bar or drink with you for right after the game, even if you plan to go out for a meal afterward. Just don't think of going out drinking! That will hurt, could damage the wrap - all the gas. Don't play until your surgeon OKs it!