go to your pitch and run suisides. every line drop to the ground and explode up. repeat 5 times that will give you stamina to loose fat clean up diet and get the miles in you don't burn fat if you are doing sprints also do four days in the weight room. 1 day legs (with deadlifts) day 2 ( upper body) day 3 off of the weights day 4 legs day 5 upper body do core every day by core i don't mean Abs im talking lower back oblequ and all the other shir no one ever dose
try running up hills , and gym exercises to suit your position in the team , e.g. if you are a forward upper body strength is needed.