Posted by ESPN.com's Adam Rittenberg
Wisconsin's defense suffered a pretty significant blow when head coach Bret Bielema announced after Saturday's practice that starting weak-side linebacker Jonathan Casillas and two other players would not travel to the Champs Sports Bowl.
Casillas underwent surgery last week after battling knee problems all season. Though the two-time honorable mention All-Big Ten selection was never 100 percent this fall, his experience and speed will be missed against Florida State. Casillas' absence shuffles the Badgers' linebacker group, with Jaevery McFadden moving from the middle to the weak side.
Sophomore Culmer St. Jean, who has 16 tackles this season, moves into the starting middle linebacker spot. Both McFadden and starting strong-side backer DeAndre Levy will need big games against the Seminoles and running back Antone Smith.