From the Game Manual
Doctors help reduce the severity of player injuries. Once a player is injured, a Doctor will also help him heal more quickly, but the effect is much smaller than the initial reduction in severity. Doctors can have the following specialties:
Taping Injuries: There is a small chance that a player's minor injury can be taped up immediately, and he will be able to return to the game at the start of the next quarter.
Massage: Players who play too many minutes in a given week will not experience as severe a drop in game shape.
Notes: Doctors are probably the cheapest staff members to pick up off the TL but they certainly have their importance. The difference between a level 1 and level 5 doctor could be the difference between a player being injured for three weeks to that same player being injured for the remainder of the game. Doctors become especially valuable when you have young trainees that can’t afford to miss a week’s worth of training or when you have an all-star player (figuratively) that your team just can’t afford to lose. For new teams, I’d recommend at least having a level three doctor and for more experienced managers I’d go with a level five. I guess the level of doctor you choose all depends on the amount of risk you want to take with regards to injury time. In terms of doctor specialties, I’m partial to massage especially if your team relies on a core group of players that see a lot of minutes.
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The ideal doctor level is very much dependant on the level that you are playing at and how much of a risk you are willing to take. A new manager could probably survive with a level 3 or less, however at higher levels where players are far better in terms of skills, and the competition is a lot closer, higher level doctors are required so that players are not being injured for 2 or 3 weeks.
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