I have a 7D2 - unless the football play ends within 2 seconds, your buffer will stall if you're shooting RAW. Plus, at roughly 25MB per frame, you'll fill your cards pretty fast. Use JPG.
Most venues (football, baseball, soccer, etc) I shoot 700-1,500 frames - most at 10fps. Most bursts are less than 10 frames.
For the single shots or 3-5 frame clips that you know you want to really sweat over, shoot both RAW and JPG. Do some experimentation for yourself - shoot both. Then in post, process both and see if the time spent, disk space taken, and buffer limits reached justify - for you - shooting RAW over JPG.
If you're doing portraits or landscapes, or just about anything but action, use RAW if you're into post processing.
Get & READ - 7D-Mark-II-AF-Guide.
Read and study the Cases. Mr Biggs is correct - if you're steady enough and you can use the single center focus point, do so. If not, use the expanded center (4-8 surrounding the center). The zones are OK, but you'll get focus on the wrong subjects enough to make you frustrated - especially if you are zoomed in.
Above all - read these boards and ask questions.
PJ
(Grampy)
"Photography is a money-sucking black hole, and I'm approaching the event horizon"
