High risk is the issue here.
At your age and condition, you face enough "high risk" playing footy, what you need to do is focus on a safe, productive and time efficient exercise program to build muscle in the areas that are at risk in the game you play.
The areas are in order of priority, exercises needed to build strength and flexibility to safe guard you;
Knees
Lower back
Neck
shoulders
Exercises areas that could improve your performance on the field;
Glute exercises
Grip exercises
Leg extensions
leg curls
Leg press are 3 very underrated exercises for strengthening the lower body.
Plyo could increase your vertical leap a tad, but IMO the risks outweigh the benefits.
If you want to take a specky, or leap high in the ruck, then practice is your best bet, spend a lot of time training.
Your time spent in the gym Working out should be minimal and safe, with a focus on making your joints stronger, and the gym is the only place for that.