Ankle sprains in soccer are not always caused when a player's planted foot folds to the inside in a funny way trying to avoid a slide tackle or making a sharp cut on the field. A player can also twist an ankle by:
As a result, make sure that players don't fool around when they are warming up before the game, that someone checks the field conditions, [1]and that all equipment, balls, bags, water bottles etc. are not near the soccer field before or during the game.
Links:
[1] https://www.momsteam.com/alpha/departments/regularseason/soccer_field_hazard.shtml
[2] https://www.momsteam.com/alpha/departments/preseason/athletic_shoe_shopping.shtml
[3] https://www.momsteam.com/users/gwenn-okeeffe
[4] https://www.momsteam.com/node/6246
[5] https://www.momsteam.com/health-safety/ankle-sprains-parents-role-in-treatment-recovery-and-return-to-play