IRVING, Texas -- The Cowboys have officially placed guard Brian Waters on injured reserve after a week of evaluation.
Waters suffered a strained rib, a hyperextended knee and a torn triceps in last weekend's loss to Detroit, with the triceps injury proving to be the most severe.
The veteran guard, who was halfway through his 13th NFL season, sought out several secondary opinions that would allow him to continue playing this year, but those were of no avail.
Mackenzy Bernadeau will start in place of Waters on Sunday against Minnesota. Bernadeau started in all 16 games last season, and he was the starter for the first three weeks of 2013 before Waters replaced him in Week 4.
It remains to be seen what Waters will do going forward. The Cowboys signed him to a one-year contract just five days before the season opener against the New York Giants. The six-time Pro Bowler played to his lofty reputation in five starts this season, but he will be 37 by the start of the 2014 campaign.
In Waters' place, the Cowboys called up defensive back Micah Pellerin from the practice squad. This marks the fourth week in a row the Cowboys have activated a practice squad player. They called up linebacker Cameron Lawrence on Oct. 11, defensive end Jason Vega on Oct. 18 and safety Jakar Hamilton on Oct. 26.
Pellerin was a standout for the team in training camp after joining the practice squad at the tail end of 2012. He has experience playing both safety and cornerback, though he has played primarily as a corner during his time with Dallas.
Cowboys coach Jason Garrett hinted on Friday that Pellerin would get the nod, as the team will be without Morris Claiborne for Sunday's game against the Vikings. Claiborne injured his hamstring in the loss to the Lions.