If you're looking to avoid Player injuries from piling up with your Football Club in Football Manager 2018, then definitely take advantage on the Sport Scientists your team uses. Sport Scientists actually give you regular updates on the workload your Players have during training, as well as how you can adjust said workload in order to reduce the likelihood of injuries from occurring. By using and implementing the advice they give you, especially when you have many upcoming matches in a short period of time, you should see a reduction in the injuries your team suffers.
On top of the Sport Scientists that assist your Football Club, Football Manager 2018 also introduces the brand new feature called the Medical Centre. Here, the medical staff on your team will actually report straight to you, the manager, on the injuries situations found with your Players on your team. On top of this, the medical staff at the Medical Centre will also advise you of any potential injury risks for players that are presently healthy.
If you can't keep the Players on your ball club healthy, odds are you won't be having much success. Because of this, you should use all the different resources you have to prevent such things from happening. It's also worth noting that most teams will have injured players when you begin your managing career with them. If this is the case for you, there really isn't much you can do help them heal any quicker. Simply keep track of how their injuries are panning out, being prepared to slowly insert them back into your lineup (if their talent level dictates such) when they come back from injury.