Okay, let me set this straight.
There is some truth ni the replies, but the system changed about 2 seasons ago.
Doctors USED to lower the amount of weeks an injury would last, AND also reduce the amount of injuries that occured during games. They DIDn't have effect on the rehabilitation speed.
NOw the system is diffrent:
Doctors with higher levels have an impact on how bad an injury is when it occurs in a game, but also, they help the player heal quicker. This effect isn't that big, but it's there, so yes, higher level doctors do heal lpayers a little quicker, yet the effect of a higher level doctor is still biggest BEFORE the injury happens.
The is no way to realy speed up healing once an injury occured. A level 5 or 6 doctor might however bring a player back 1 game earlier then a level 1 or 2 though, but it will be only 1 game...
They are not your friends; they dispise you. I am the only one you can count on. Trust me.