PITTSBURGH -- With concern regarding the health of Sam Bradford's injured left knee, the Minnesota Vikings promoted practice squad quarterback Kyle Sloter to the 53-man roster on Saturday, the team announced.
A source told ESPN's Chris Mortensen that Bradford underwent an MRI on his knee on Tuesday, though the scan did not reveal any specific damage. The quarterback experienced pain, swelling and discomfort in his left knee following the Vikings' season-opening win over the Saints -- the same knee he had surgery on in 2013 and 2014 to repair a torn ACL.
Having three quarterbacks on the active roster foreshadows elevated concern about whether Bradford will be ready to go on Sunday.