What is the "magic spray" that trainers use in professional soccer (football) games?

When a player gets injured, the trainers have an aerosol spray they use on the injury that seems to help the pain. Commentators love to refer to it as the “magic spray.”

Of course, the feigned injuries that are (unfortunately) common in professional soccer are part of the reason the magic spray is so effective, but I’m curious as to whether the contents of the aerosol can help in any way with legitimate injuries or whether it is just something the trainers spray on the players so that they are doing something when someone acts injured.

For what it’s worth, I have been a fan of soccer for quite a while, but my curiosity was peaked when I saw a trainer spraying the contents of the can on the outside of an “injured” players cleat during the Euros.