SAN FRANCISCO (AP) -Minnesota Vikings receiver and punt returner
He sustained the injury in the team's exhibition opener at St. Louis last Saturday. Minnesota made the announcement before the Vikings played a preseason game Sunday night at San Francisco.
The 26-year-old Johnson, who had a shot of making the 53-man roster, caught one pass for nine yards last season. He spent the 2008 campaign on the practice squad after the Vikings picked him in the sixth round of the draft out of Jackson State.