I sprained my ankle pretty badly in the summer playing box lacrosse, it’s not a hard thing to play through. The swelling won’t go away as long as he continues to run but the pain subsides. A good tape job helps. I sprained mine at the end of my first playoff game, played 5 more games in just over two weeks. I also played in two tournaments shortly after the season. I play on a concrete floor so I don’t know how the ankle will hold up on a field wearing cleats, that grab could cause problems.