McGrone suffered a dislocated elbow during training camp, which led to his placement on injured reserve, James Boyd of The Athletic reports.
McGrone's injury was previously unknown, but he clarified the issue with Boyd on Thursday. The Michigan product underwent surgery to help repair the injury and plans to return this season. Exactly how much longer he'll be out remains unclear, but his placement on IR before Week 1 means he'll be out at least three more weeks.