Wouldn't worry about 4k so much just now. 1080p 24fps minimum, if you want to do slow mo, at least double the frame rate to 50.
I've used a Canon 7D, GoPro and a Canon M50 for stuff around about the game (interviews, behind the goal etc), our guy uses a cracking wee camera that does 1080p, best attribute I think is that it's waterproof!