From the wiki's latest update (Sept 15), Kyler Murray remains in concussion protocol and his status for Week 2 against the Bears is uncertain (from the Carson Wentz page and the article Vikings QB Kyler Murray remains in concussion protocol; status for Week 2 is uncertain).
He suffered the concussion in the first quarter of Week 1 against the Packers. Carson Wentz replaced him and played brilliantly — 12-of-19 for 133 yards and 3 TDs in a 39-22 comeback win. Wentz would be the starter again this week if Murray can't clear protocol.
On Fantasy Football Today, the crew noted: "We got the Kyler Murray concussion," adding that his status is a key factor heading into Week 2 waiver wire decisions ().