The Minnesota Vikings will head into their Week 2 matchup against the Pittsburgh Steelers without quarterback Sam Bradford.

Bradford has been put on the Vikings’ inactive list just before Sunday's game at Heinz Field against the Pittsburgh Steelers, and according to Josh Alper of Pro Football Talk, backup Case Keenum will be the one calling plays on the field for the meantime.

Case Keenum will make his first start since joining the Vikings and Kyle Sloter will serve as the backup after being promoted from the practice squad.

Bradford had a great start to the season, throwing for 346 yards and three touchdowns without an interception on 27 of 32 passes in Minnesota’s Week 1 29-19 home win over the New Orleans Saints.

Bradford’s availability for Week 2 was first questioned when it was reported that he had undergone an MRI after feeling discomfort in his left knee – the same knee that had suffered two ACL tears in the past.

Bradford’s absence puts a dent on the Vikings offense that began the season looking sharp with the quarterback playing sweet music with his targets downfield, particularly to Adam Thielen and Stefon Diggs. Keenum, however, is an experienced quarterback, one that has plenty of experience as a starter. He passed for 2,201 yards and nine touchdowns with 11 interceptions last year for the Los Angeles Rams.