Old volleyball player and weightlifter . developed mild supraspinatus tendinosis according to an ultra sound. is return to play possible ?

Absolutely: Return to play if that is 'all u have' should not be a problem. Ss tendinitis can be treated w/ nsaids , rot. Cuff strengthening and an occ. Injection .I would say , however, that you should be thouroghly examined ( w/ possible MRI as well) to exclude other coexisting shoulder problems such as instability, slap/labral tears etc.Best of luck!