I recommend WS4SB 2-day a week program for in-season, and the 3-day-a week program for offseason.
I also like the 5 x 5 suggestion. Pick 4-5 lifts (bench, squat, deadlift, pull-ups, dips), keep things short, warm-up, lift, maybe add in a few curls for da girls, and then get out of the gym(maybe even give yourself a time limit to be in and out of the gym). The gym should be a supplement to your football training, and not cause any injuries or impact your football training in any way.
When I used to play football, I would go to the gym for 40 minutes before my actual football training, as this was a way to allow more time for recovery from training in preparation for the weekends game and also was a way to stop myself from absolutely destroying myself with weights as I needed to leave something left in the tank for actual training.
As long as you are doing your time on the training pitch its going to be hard for you to get too big.