"Ben - we are extremely concerned for your health. For your back tightness, please tell us what doctor you're going to and sign a release so that we can talk to him and make sure you don't play before you are completely ready. And for your mental health issues, we will do the same thing. Let us know what mental health professional you are seeing so that we can coordinate your care and don't bring you back too soon.
If you don't have a doctor for either of these issues, we are happy to recommend one for you."
I have to believe that injury is a big enough issue that contracts generally require some level of communication regarding the players health and/or require the player to meet with the teams doctors - along with their own if they don't want to rely solely on the team's doctors.