The simple solution is to wrap it to an adjoining digit.
When you go to the doctor with a foot injury, there’s not much they can do. When you go in with a finger injury, they’ll probably put it in a finger-splint. The splint protects it, but makes it pretty impossible to play your sport. Athletic trainers, on the other hand, have a simple solution that works beautifully: Use strips of tape to join the finger or toe to one next to it. Avoid the joints so they are free to bend, and you lose very little in the way of manual dexterity. The adjacent digit, meanwhile, acts as a protective splint, and you can keep playing until the injury heals. (Use this one judiciously. Sometimes, a visit to the emergency room is appropriate!)