Thanks for the reply. Right now I'm working out Monday, Tuesday, Thursday, and Friday. The lifting is based off of percentage based lifts (bench for upper body, power clean and back squat for lower) followed by assistance exercises (lat pulldowns, db shoulder press, lunges, calf raises, etc). The reps for the main lifts typically have two variations, high volume (lots of reps on bench, lots of sets on squats) and low volume (2-5 reps on bench and squat, cleans are always low rep and fairly heavy). The sprinting consists of 60 yard shuttles, 1/2 gassers, 20 yard sprints, and 110 yard striders. All of that is prescribed by the team, so I'm not going to change any of that.
The reason I want to add another workout to kill it with conditioning is because I talked to the coach and he pretty much said, "You're a freshman, you're going to get a lot bigger and stronger over the next four years. Your main goal now should be to report in shape and able to keep up, because that's gonna be the killer."