Otanez was diagnosed with a right shoulder impingement Sunday and has been shut down from throwing, Martin Gallegos of MLB.com reports.
The right-hander hasn't officially been ruled out for Opening Day, but he's unlikely to be available since he suffered the injury so late in camp. Otanez is expected to fill a high-leverage role in front of closer Mason Miller once healthy. Jose Leclerc and Tyler Ferguson are likely to handle setup duties in the meantime.