Prevent infection from a lost toe nail?

A 2 months or so ago at football practice I stubbed my pinky toe in my shoes (size 13's are too small i guess haha). It hurt for a bit and turned black. Today I picked up a towel and it dragged across the toe nail and pulled it out of place a little. I figure it will fall off on its own soon, but when it does, how can i protect it from infection from the bacteria in my sweat? (Football practice in hot weather = foot sweat)