Nebraska lost three defensive players for the season on Friday.

The school announced Friday morning that cornerback Charles Jackson needs season-ending knee surgery and in the afternoon announced that safety LeRoy Alexander was suspended for the season. Later that night, linebacker Michael Rose posted on his Instagram page that he will miss the season with a knee injury.

The school did not indicate why Alexander was suspended but he will remain with the team.

"Alexander will remain on scholarship as a member of the Nebraska football program and will be allowed to practice with the team," the school said in a statement. "Coach (Bo) Pelini and the Nebraska Athletics Department will have no additional comment on this matter."

Nebraska did not confirm Rose's injury, but Rose wrote that he tore an ACL, possibly an MCL and cartilage. He also wrote that he expects an update on Saturday.

Jackson spent much of the last two seasons on special teams, but was in contention for the nickel corner spot this season.

Alexander was in line to start at safety. He had 34 tackles in 13 games last year.

Rose set a freshman record last season with 66 tackles.