With Bradford ailing, Vikings bring up QB Kyle Sloter

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FILE - In this Monday, Sept. 11, 2017, file photo, Minnesota Vikings quarterback Sam Bradford throws a pass during the team's NFL football game against the New Orleans Saints in Minneapolis. For the first time since 2014, Bradford is a captain again. He's also the NFC Offensive Player of the Week, after his stellar performance for Minnesota in the season-opening win against New Orleans. Finally settled with the Vikings after a whirlwind 2016, Bradford is becoming just the leader this team needs. (AP Photo/Bruce Kluckhohn, File)

MINNEAPOLIS (AP) - With starting quarterback Sam Bradford listed as questionable for Sunday's game with a knee injury, the Minnesota Vikings have signed quarterback Kyle Sloter from their practice squad.

Backup quarterback Case Keenum would start in Pittsburgh if Bradford cannot play.

Bradford played one of the best games of his career in a season-opening victory over New Orleans on Monday night. But he was limited in practice this week after coming out of the game with an injured left knee.

The Vikings opened the season with only two quarterbacks on the active roster and Teddy Bridgewater on the physically unable to perform list.

Sloter was cut by the Denver Broncos in the preseason before signing with Minnesota's practice squad. He would give the Vikings some insurance behind Keenum should Bradford be deactivated for the game.

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