Any formation or tactics advice given is based purely on experience with my teams...
It could happen to any player. Heavy training followed by starting in the following matches just increases the chance of injury (it is still a hit a miss when it comes for the player to be injured or not). Heal him with red packs; no need restrict yourself on the belief that if a player gotninjured and is healed by red packs, he will perform badly; you might be suprised when you will observe the opposite happening. This game has no AI.