Hey Kevin,
I'm sorry but I guess I really don't understand the question. A loose shoulder doesn't translate into a healthy and stable one.
I can't really answer your question because giving you a menu of stretches could be setting you up for further injury. Continue doing range of motion, dynamic activities prior to practice and games. Make a large focus of your preventative shoulder activities geared toward external rotation.
I hope this makes sense. You could have protracted shoulders and if I prescribe a stretching protocol that includes extensive posterior flexibility, you would be setting yourself up for disaster.
Will Haskell
Athletic Development Specialist
www.tsanorthwest.com