How can I loose weight for football while playing baseball?

I'm a freshman in high school and I played varsity football but I also play baseball during the off season. I'm really strong an in shape but I still have a lot of fat. I'm 5'11 and 235 pounds but I'm very strong and bench 245. I would workout after school after football ended but now I'm playing baseball and I'm not that active in baseball of course and I'm starting to gain weight but I still workout in the mornings but thats just lifting weights during athletics. I was wondering if there are any diets that I can go on that really work until baseball ends. I'm not gonna quit because that's not me but I am NOT playing baseball next year.