Well it all depends on what weights you're going to do, swimming isn't going to get you into the shape that you need for football.
Football requires bulk and weight. Swimming will not bulk you up, it'll build you muscle, but it'll tone it more than build it.
In terms of what workouts to do for Football;
Swimming; Cardio. Try and do 4 laps (that means there-back is 1 lap, so with that, that means there-back, there-back, there-back, there-back) and then take a 30 second break and do it again. Your shoulders will start to hurt, that is good, keep on pushing through it.
For your full-body workouts do; Squats, Wide Grip pull-ups, inclined bench press, Military press, standing barbell curl, decline dumbbell situp.
And run. Every day. Literally. Every. Single. Day.