Welcome to the forum.
Were you using the 70-200 F4? or the 70-200 F2.8?
I'm guessing that it was the F4...but I may be wrong.
As others have pointed out...you need to use a faster shutter speed. This can be a problem because the lighting on football fields is usually pretty poor, and this one looks to be no exception. You will need to use your widest aperture and then maybe adjust your ISO higher...and that may still not be enough.
Have you seen the lenses that Pro photographers use at football games? They are easy to spot because they are huge...and they are so heavy that use of a mono pod is almost mandatory. Those lenses cost about as much as a small car....but that it what it takes to get their shots...and those games have better light that you have here...so you may be fighting a loosing battle.
You can do the best with what you have though. Use your maximum aperture, and a high ISO. Use a tripod or monopod...or at least rest the lens on something solid. Try to shoot when there is action...but not a lot of fast movement...like at the top of a jump, or a quarterback about to throw etc.