My injuries have begun to pile up

I've now got a handy dose of injuries, and I'm wondering how to prepare for the next game week. I've got 1 free transfer, and used my WC for GW3 (which I now regret).

Those injured for me are:

• Kyle Walker

• Monreal

• Aguero

• Shaqiri

• Friend

Luckily some of these injuries aren't "injuries" (Aguero), and we have the international break for players to heal up from slight knocks. I'll give it some time before I use my transfer, but I'd like to get general input from others. How do you prioritize injury replacements generally? How do you avoid injuries (other than just avoiding players who are obviously injury prone)?