Injuries piling up for Vikings defense

Posted by ESPN.com's Kevin Seifert

We'll get you our daily Black and Blue roundup a bit later this morning, but this news out of Minnesota deserves its own post.

It appears safety Madieu Williams will miss an extended period of time due to a neck injury, according to the Star Tribune. Williams, who signed a six-year, $33 million contract as one of the Vikings' three major acquisitions during the offseason, won't play before the Vikings' Sept. 28 game at Tennessee.

The exact nature of the injury hasn't been disclosed, and as a result the Titans game could be the early end of Williams' timetable. He likely will be replaced by rookie second-round pick Tyrell Johnson, but Johnson himself missed practice Monday because of a strained abdominal muscle.

As a result, second-year player Eric Frampton was working with the first team on Monday. The Vikings also have veteran Michael Boulware on their roster.

Injuries are starting to pile up for the Vikings' defense. Linebacker Heath Farwell and defensive end Jayme Mitchell both suffered season-ending knee injuries in last Friday's preseason opener against Seattle. Defensive end Brian Robison has missed most of training camp after having two blood clots removed from his leg, and the Vikings are being careful with the surgically repaired elbow of nose tackle Pat Williams.