Green Bay Packers safety Sean Richardson has suffered a career-threatening neck injury, according to Tom Silverstein of the Milwaukee Journal Sentinel.

Silverstein reports that Richardson has suffered a herniated disk in his neck, an injury similar to the one he suffered back in 2012.

Richardson was able to return from that injury after fusion surgery, but with this second herniation reportedly directly below the fusion, his career could be over.

It is not yet known how or when Richardson suffered the injury.

Packers fans will understand the severity of neck injuries of this kind, after former Packers players Jermichael Finley and Nick Collins both were unable to return from their respective fusion surgeries.

The safety was officially ruled out for Sunday on the team's injury report.