Give up your 7'3" MVP center? I strongly suggest not to. Injuries are very random and I do not believe any certain players get injured more than others for any reason. Your doctor doesn't help prevent injures (nor does your tactics, effort, or trainer), your doctor only effects how quickly he will be back from his injury, because the time length decreases as you get better doctors. You did nothing wrong and there is nothing wrong with your player being injury prone, so definitely keep him! You CANNOT sell a 7'3" big man with that nice potential. As for the training... Train him exactly as you would have beforehand. It doesn't change his training at all, it just delays it for a little while.
Hope this helped!
Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs