The Bengals declined to declined to comment, citing coach Marvin Lewis' policy of not addressing any potential injury issues until training camp has started. Cincinnati's first camp practice is Friday.
Kirkpatrick, the 17th overall pick of the 2012 draft, was expected to compete for a starting cornerback job if Leon Hall hadn't fully recovered from his Achilles injury. He was expected to be the nickel back at worst.
This injury would keep a talented rookie off the field but it hits one of the Bengals' deepest positions on the team. In addition to returning starter Nate Clements, Cincinnati has three former first-round picks (Adam Jones, Terence Newman and Jason Allen) as well as promising third-year veteran Brandon Ghee at cornerback.