The 26-year-old safety confirmed the agreement via Twitter:
Pittsburgh!!!!!! First I have to thank God for this blessing and Mr. Rooney and the Steelers organization for such a great opportunity!â Mike Mitchell (@MikeMitchell34) March 11, 2014
Widely ridiculed as a second-round "reach" pick by legendary Raiders owner Al Davis in 2009, Mitchell turned his career around by finishing only behind Luke Kuechly and Thomas Davis in total tackles with the Panthers last season.
An upgrade on the aging free-agent Clark, Mitchell offers more range and packs more punch as a hitter. The question is whether he can sustain that level of play without benefit of Carolina's stacked front seven.
In the latest edition of the "Around The League Podcast," the guys study the free agency picture with the help of NFL Media Insider Ian Rapoport.