One of Notre Dame’s top defensive backs suffered a torn ACL during practice on Tuesday, according to a report.

Thursday afternoon, Matt Freeman of Irish Sports Daily reported that defensive back Shaun Crawford tore his ACL while at practice earlier in the week. the tear was in his left knee.

Crawford has suffered several injuries in his college career, including an ACL tear in his right knee as well as an Achilles injury.

Last season, Crawford played a full season for the Irish and served as a key defender on a team that finished 10-3 and ended the year ranked No. 11 in the Associated Press poll. The defensive back registered 32 tackles and two interceptions in 2017.

The loss of Crawford is huge for No. 12 Notre Dame, as it hosts No. 14 Michigan in the season opener in South Bend.

Saturday will mark the first head-to-head matchup between the Fighting Irish and the Wolverines since 2014.