HD is a little different than HBD, etc. When you're ready to put your guy back into the line-up you can, but if he isn't healthy enough you're taking a chance on getting him hurt even more. The more he's hurt, the more his game will suffer and the bigger chance you're taking on getting him hurt again. I agree with Weena. I'll usually keep a hurt player out until he's at least 80% and then ease him back in...