The Oakland coach believes Hayden could miss four to eight weeks from the time of the surgical procedure, per the San Francisco Chronicle's Vic Tafur. The surgery was about a month ago, and Hayden was subsequently placed on the physically unable to perform list.
"It's disappointing for him and for me because he's a guy we were counting on being able to step up and help us this year and he's a young player and he needs the reps."
It's a big blow for a player the Raiders are counting on to make a quantum leap in his second season. The Silver and Black selected Hayden with the No. 12 overall pick in the 2013 draft, but he didn't make an impact as a rookie. He's slated to be the team's No. 1 corner this year, and is one of the few holdovers in a revamped defense packed with veteran imports.
Hayden also was absent from part of camp last year while recovering from surgery to remove scar tissue from his abdominal region. That followed a scary Nov. 2012 incident in college where Hayden nearly died. He suffered massive internal bleeding after a routine collision with a teammate during practice at the University of Houston, and it was thought Hayden would slip in the draft amid concerns.