The school announced Wednesday that Collinsworth, who suffered the injury during the spring, is expected to miss the next four to six months.
The 6-foot-1, 202-pound Collinsworth, the son of former NFL player and current broadcaster Cris Collinsworth, has played in all 26 games through two seasons in South Bend, Ind., recording 25 tackles and forcing one fumble. He was named the Irish's special teams player of the year last season, in which he had 16 special teams tackles.
The Fort Thomas, Ky., native was expected to see significant time this season behind starters Jamoris Slaughter and Zeke Motta, as Notre Dame often plays three safeties in its nickel package. Notre Dame is also replacing two starters at cornerback.
Collinsworth, a rising junior, has yet to take a redshirt year.