With Anthony Barr (knee) and Brandon Watts (hamstring) listed as out and Chad Greenway (knee) questionable, the Vikings have only three healthy linebackers on the 53-man roster. But that probably will change soon, Vikings coach Mike Zimmer said after practice today. The Vikings are expected to promote one or both of their practice squad linebackers, depending on whether Greenway can play on Sunday. Asked about the readiness of the two practice squad players — third-year pro Josh Kaddu and recently-signed rookie Justin Anderson, Zimmer said, “I think they’ll be fine.” As for his level of concern about a position that has only Gerald Hodges, Jasper Brinkley and Audie Cole as healthy bodies, Zimmer said, “None.” Although Greenway hasn’t practiced all week, the team listed him as questionable.