Daily 25 green packs from ads is for training, while the other 15 ads should be on funds first, then on red packs before end of season. Assuming max team bonus would cost 2 ads (or even 1 ad - https://forum.topeleven.com/tutorial...yer-bonus.html ), you could save 13 reds in each of the last 7 days of a season, plus 1 each from friend’s gift, and a few more from matches and boxes, before the next starts. That 100+ reds should last you a whole season of injuries.

Upgrading the pitch should help reducing injuries, though injuries are quite random that luck (or lack of) may be even more of a factor.