Vikings placed QB Sam Bradford on injured reserve with a knee injury, ending his season.
ESPN's Chris Mortensen reported Tuesday that Bradford had his left knee scoped by Dr. James Andrews with the hope of "easing pain and discomfort" the quarterback has experienced.
Keenum replaced Bradford in the Bears game and led Minnesota to a 20-17 victory, and he's won each of his four starts since then.
Bridgewater practiced with the team on October 18 for the first time since his injury.
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Mortensen says Andrews had previously shared that Bradford's knee is structurally sound, and nothing he saw during Tuesday's procedure would indicate anything different.
Bradford, who turned 30 on Wednesday, will become an unrestricted free agent next season.
Vikings game kicks off at noon Sunday on FOX.
The Vikings have a decision to make at quarterback. He tore his ACL and suffered a dislocated knee in a gruesome practice injury before the 2016 season. He was a Pro Bowl selection in 2015 when he passed for 3,231 yards and 14 touchdowns against nine interceptions.
Following Bridgewater's injury a year ago, the Vikings traded for Sam Bradford, who opened this season with a 346-yards, three-touchdown opening win game against the New Orleans Saints - a 29-19 Vikings victory.