The AFL has a National Risk Protection Program through Jardine Lloyd Thompson (JLT). Part of the arrangement is an insurance product that provides some coverage for injury associated with training or games. In general, it covers supplemental/non medical type costs above an excess threshold.
The AFL JLT link has the full product description and claim form.
The club doesn’t play any part in the claim process, so to claim for your player please lodge directly using the claim form to the insurance company address.