LSU football received bad news regarding star linebacker Harold Perkins Jr. on Sunday.

Perkins, a preseason All-SEC selection, is expected to miss the rest of the season with what's believed to be a torn ACL, according to multiple reports, first by 247Sports' Matt Zenitz and later confirmed by ESPN.

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It's a tough blow for the Tigers, who are to be without their best defender for the remainder of the season. The former five-star recruit is also expected to be a potential first-round pick in the 2025 NFL draft, although he still has another year of eligibility remaining.

Perkins Jr. had 17 total tackles, including 1.5 for loss, through four starts this season. He also combined for 147 tackles, 13 sacks, seven forced fumbles and two interceptions through his first two years in Baton Rouge.

His injury came on a tackle attempt in the fourth quarter of LSU's 34-17 win over UCLA on Saturday. Here's everything to know about Perkins Jr.'s injury:

Harold Perkins Jr. injury update

Perkins Jr. reportedly tore his ACL in the fourth quarter of LSU's win over UCLA on Saturday, which will reportedly sideline him for the rest of the season, according to 247Sports and ESPN.

Perkins Jr. attempted to make a tackle in the quarter and instantly went down in pain. LSU coach Brian Kelly noted after the game that Perkins Jr. was injured but did not confirm further details. The report of Perkins Jr. tearing his ACL came out Sunday, before Kelly could confirm this news in his weekly news conference.

What is Harold Perkins Jr.'s injury?

Perkins Jr. reportedly suffered a torn ACL in LSU's 34-17 win over UCLA on Saturday, according to 247Sports and ESPN.

He was first ruled out for the game with a knee injury, but the reports later indicated he suffered a ligament tear.

This article originally appeared on Lafayette Daily Advertiser: Harold Perkins Jr. injury update: LSU LB out with ACL tear | Report