The Vikings expect to have four quarterbacks in London for Sunday's game against the Browns.

Who starts?

"We'll see," head coach Mike Zimmer said Monday.

Zimmer anticipates both quarterbacks Sam Bradford and Teddy Bridgewater to travel with the team to London. Their flight departs after Wednesday's practice and lands in the U.K. on Thursday morning, about five hours before their first scheduled practice.

The Vikings are allowed to activate Bridgewater from the Physically Unable to Perform list at any time and start him. However, they are only a week into the allotted 21-day window to evaluate him in practice after his devastating injury. An upcoming match against the winless Cleveland Browns could also make the decision easier to continue rolling with backup quarterback Case Keenum, who has helped lead the Vikings to four wins this season.

Bradford, whom Zimmer said continued to see specialists for his injured left knee last week, has not practiced since he was pulled from the Oct. 9 win in Chicago.

Also on Monday, Zimmer defended safety Andrew Sendejo's hit on Ravens receiver Mike Wallace, which knocked Wallace from the game due to a concussion and drew a 15-yard penalty for hitting a defenseless receiver. The flag was thrown late by an official while Wallace received medical attention on the field.

"I think the receiver took five steps after he caught the ball and I think [Sendejo] hit him with a glancing blow," Zimmer said. "I know what [the officials] told me, but I'm going to turn it in and see what they say. [Wallace] established position as a runner, took two extra steps and Xavier [Rhodes] was trying to pull the ball out, which he ended up doing. The guy went down a little bit, but in my opinion he was a runner."