Coach Willie Taggart on Monday announced the season-ending injury for Kaindoh, who has been listed as a co-starter at the "edge" position. He appeared in FSU's first three games and recorded nine tackles, including 2.5 for loss and a sack.
Kaindoh sustained the injury in the second quarter of Saturday's loss at Virginia. He couldn't put weight on his leg leaving the field and needed crutches while on the sideline.
The 6-foot-7, 261-pound Kaindoh has 45 career tackles, including 13.5 for loss and eight sacks, in 28 games (two starts). He came to FSU as ESPN's top-rated defensive end and No. 13 overall player in the 2017 recruiting class.
Florida State (1-2) hosts Louisville (2-1) on Saturday.