A statement released by the school said an MRI revealed Day tore the ACL in his left knee.
“It is difficult because B.J. has worked hard in the offseason to get ready for the start of practice,” Miles said. “We look forward to him beginning his rehab, and our goal is to have him ready for the start of next season.”
Day, who will apply for a medical redshirt, according to the statement, averaged 14.5 points and 6.5 rebounds as a senior at Lincoln Southeast High School.
Nebraska went 19-13 last season and qualified for the NCAA Tournament for the first time since 1998.
- Chris Johnson