The Vikings signed safeties Shaun Prater and Anthony Harris to the 53-man roster Tuesday and placed safety Antone Exum Jr. on injured reserve.
The moves come less than 24 hours after all four safeties — Harrison Smith (knee/hamstring), Andrew Sendejo (knee), Robert Blanton (knee) and Exum (ribs/shoulder) — missed practice Monday.
Exum fractured a rib and injured the AC joint in a shoulder during Sunday’s 38-7 loss to Seattle and will miss the rest of the season. Sendejo returned to practice Tuesday, but Smith and Blanton still were sidelined a day before leaving for Arizona for Thursday night’s game against the Cardinals.