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@DFP
Yeah better after for a few reasons;
1; eating carbs makes you sleepy, so your performance in football maybe subpar
after strenous exercise your muscle & liver glycogen are at least partially depleted. So when you you eat your carbs, it can just refill this empty capacity. When you "overfill" it gets turned into fat.
After strenuous exercise, your body enters a special state where it can use this raw simple energy much more efficiently, and for desireable purposes. It is more sensitive to insulin (which is secreted when you eat carbs) which drives the nutrients into your muscles. There are also some mechanisms of absorbtion I dont really understand, but they happen only after exercise. So you need less insulin to mop up these carbs, and they are used for feeding your muscles instead of making you fat.
Why is it bad to eat carbs without activity and allow your body to excrete large amounts of insulin you ask? Because it leads you to losing sensitivity to this insulin, which means you need to excrete more and more of it. This is a disease which goes by the name of Type II diabetes and is extremely common in countries where people eat a lot of carbs and do not do very much.
Some googling will give you more details and countless research 'proving" it such as this;
http://www.ncbi.nlm.nih.gov/pubmed/10683091
Also look up "carb backloading"
If you feel you lack energy before you game of football, it might be better to carb up the night before. So the carbs help you get a good nights sleep, but at the same time you are not groggy from the carb induced drowsiness. This will not help with the weight loss however, unless you did exercise the day before also.