The Minnesota Vikings, already depleted at the safety position, put Antone Exum on injured reserved Tuesday. With starters Harrison Smith and Andrew Sendejo nursing injuries, the team signed a pair of safeties: free agent Shaun Prater and, off the practice squad, Anthony Harris.
The Vikings also released defensive end Justin Trattou to make room on the 53-man roster.
Exum started against the Seahawks on Sunday and played 66 snaps on defense, second-most on the team. But late in the game he fractured a rib and injured the AC joint in his shoulder. Exum had five tackles and a forced fumble vs. the Seahawks and finishes with 13 tackles this season.