MAIN IDEIA: it's bad to have injured players ... but it's worse to have injured and still have to pay them wages .
COST: sports insurance for work accidents, think a rate between 3% to 5%, focus on the volume of weekly players wages, will be ideal. The insurance weekly cost will be, in most teams, perfectly bearable.
MORE OPTIONS: as in scouting can have various levels of investment, this also can have various levels of coverage. Maybe something like this:
Op 1 - (NONE) - No Insurance;
Op 2 - LOW COST - a lower rate (1% or 2%) ensures the salary from the 2nd week of stopping. Players with one week injuries does not give any compensation;
Op 3 - NORMAL - ensuring the salary for the period of the injury;
Op 4 - VIP - higher rate (perhaps 10%) to ensure, in addition to salary, extra compensation set by the player's wage and also if he's in NT. If you have a NT player that can not play for the national team you will have a loss in merchandising . This compensation may be 10% (and plus 10% - total 20% - if is a NT player) of the player's wage in question.