Minnesota Vikings quarterback Teddy Bridgewater suffered a "significant" left knee injury during a non-contact incident in Tuesday's practice, coach Mike Zimmer said.
An ambulance pulled up to Minnesota's training facility shortly after the injury, which saw the Vikings' practice brought to a halt around 30 minutes into the session.
Zimmer told reporters the Vikings are awaiting the results of Bridgewater's MRI to determine the extent of the injury.
"Today is a disappointing day," Zimmer said. "The number one thing is Teddy is such a great kid. Everybody loves him, and today [the players] were disappointed.
"Tomorrow we'll get back to work. We're not going to put our heads in the sand. We're not going to look for excuses. We'll get through it."
Bridgewater started all 16 games last year while leading the Vikings to the postseason. He completed just over 65 percent of his passes with 14 touchdowns and nine interceptions. He also rushed for 192 yards and three more scores.
Backup Shaun Hill will likely take over the starting role if Bridgewater's injury is as serious as many fear, but Minnesota could look for better options in free agency or the trade market.
Asked if the Vikings would pursue another quarterback, Zimmer said: "I don't know yet. [General manager] Rick [Spielman] and I haven't talked about it. We'll wait on an update on Teddy."