To the height statement above, It would not surprise me in the least bit, your height varies even throughout the course of the day. This is due to the compression of the discs in your spinal cord. All athletes have this more so than the general population due to the increased impact on their spine (high impact training is the main culprit).
On another interesting note, measure yourself the moment you wake up, do some high impact activity (run 2 mi on asphalt) and then measure your height again before going to sleep at night, you will have shrunk in the course of the day, then when you awake in the morning you should come back to the measurement 24hr ago, due to the discs regaining their form, but for Football Players the repetitive trauma will cause even greater loss of height.