A son of legendary Michigan football coach Bo Schembechler said he told his father that former team doctor Robert Anderson molested him during a physical exam in the 1960s and that the revered coach ignored the complaint and went out of his way to make sure Anderson kept his role with the team.

Matt Schembechler, 62, said he was sexually molested by Anderson when he was 10 years old, within a year of when his adopted father was hired to coach the Wolverines and his family moved to Ann Arbor. Matt said Anderson fondled him and did “an anal probe” when he visited the doctor for a sports physical prior to joining the pee wee football team. According to Matt, when he shared those details with Bo, the coach told him he didn’t want to hear about it and then got physically violent with both Matt and his mother.

“That was the first time he closed-fist punched me,” Matt told ESPN. “It knocked me all the way across the kitchen.”

Matt plans to address his claims further in a news conference Thursday afternoon alongside two former Michigan football players who say they also attempted to warn Bo Schembechler about Anderson’s abuse. Anderson and Bo Schembechler both died years before any claims about these issues became public.

Anderson worked at the University of Michigan from 1966 through 2003. During the majority of his time at the school, he worked closely with the athletic department, treating athletes’ injuries and conducting annual physicals. Hundreds of former patients — many of them former Wolverine athletes — now say that Anderson sexually abused and harassed them in a variety of ways during the treatment of routine medical issues. In interviews and court documents, Anderson’s former patients say the doctor assaulted them, fondled them and made an array of inappropriate sexual comments, among many other examples of misconduct. Bo Schembechler died in 2006. Anderson died in 2008.