EDEN PRAIRIE, Minn. (AP) — Minnesota Vikings quarterback Teddy Bridgewater has suffered a "significant" knee injury and the team is awaiting tests to determine the severity.

Bridgewater was taken to a hospital by ambulance on Tuesday afternoon shortly after going down in a non-contact drill. His left leg was immobilized in an air cast and players huddled around him in prayer after he crumpled to the turf.

Vikings coach Mike Zimmer ended practice after Bridgewater went down. He says it doesn't look good, but has not yet ruled out Bridgewater returning from the injury.

Losing Bridgewater would be a crushing loss for a team coming off of an NFC North division title that expected to contend for a Super Bowl appearance this season.

The Vikings have 36-year-old veteran Shaun Hill as Bridgewater's primary backup.

Also, the Vikings have released center John Sullivan, ending his eight-year tenure with the team after he missed last season because of a back injury.

Sullivan was among the 13 players let go by the Vikings on Tuesday to meet the NFL deadline for reducing rosters to 75. Joe Berger will be the starting center.

Also cut by the Vikings were offensive tackle Austin Shepherd, defensive end Theiren Cockran, offensive tackle Sean Hickey, tight end Brian Leonhardt, defensive tackle Claudell Louis, receiver Marken Michel, linebacker Terrance Plummer, wide receiver Terrell Sinkfield, quarterback Brad Sorensen and wide receiver Troy Stoudermire. Defensive tackle Scott Crichton and safety Antone Exum were waived with an injured designation. Offensive lineman Mike Harris was placed on the non-football illness reserve list.

More From KROC-AM