As a power lifter, I did both these exercises competitively. Deadlifts will not limit your flexibly. They have found weightlifting increases your flexibility, so don’t worry about Deadlifts limiting it. Maybe you should try sumo deadlifts. It is a form of deadlift some power lifters perferre to use, to help them lift more weight, they spread there legs out a lot more when they lift. It is hard to explain, go to a powerlifting site look at the pictures, you will know it when you see it. They look like a cross between a deadlift and a sumo wrestler’s starting stance. As for squats, they can be bad on your knees, if you do them wrong. Keep your feet in a comfortable position, don’t pointing straight ahead, but don’t point your toes to wide, don’t use weights that are too weight the first few times. If you skill are a bit skeptical, you can drop the deadlifts, but I would not advise dropping the squats unless you have suffered a serous leg injury. Squats work your thighs, your calfs, your foot, your hips, your lower back, your abs, ever you lat and traps and arms come into it some. The squat will help you to hold your grounds, and force your foes back. Squats are a must for all sportsmen!