Well, arguably you could do some research into what teams are short on players or have the motivation or demonstrated past inclination to have games called off - so avoid Burnley players or anyone due to play Burnley, for example - but that is admittedly a very inexact science, and once in a while there may even be a genuine, spontaneous outbreak that prevents a team playing. The other obvious trick is to diversify your team, try to stick to one player per club.