Seahawks' Russell Wilson on knee: 'I'll be good to go'

What we know about Wilson's injury (1:24)

Sheil Kapadia breaks down the Seahawks' 37-18 win over the 49ers and provides an update on Russell Wilson's injury that forced him to exit the game in the third quarter. (1:24)

SEATTLE -- Seahawks quarterback Russell Wilson suffered a left knee sprain in the third quarter of the team's 37-18 win over the San Francisco 49ers, and he will have an MRI to determine the severity of the injury.

"I don't think it's as severe as it looked, thank God," Wilson said. "I have to do some tests and check all that stuff out, but walking fine and all that, moving it well. We've got good mobility.

"I'll be good to go."

Seahawks coach Pete Carroll said Wilson was "most likely" going to be fine.

"He has no intention of thinking anything other than that he is playing," Carroll said. "He sprained his knee a little bit. He was lucky. He was in a bad situation. He knows it too. He lucked out that it wasn't worse. We'll see how he does."

In the third quarter, Wilson scrambled and tried to stiff-arm 49ers linebacker Eli Harold, but Harold brought him down, and Wilson's left leg bent awkwardly as he went to the ground.

Wilson missed one snap before coming back in to finish the drive.

"I don't know if I did it on my own," Wilson said. "I told them. They didn't hear me, but I said, 'Guys I'm going back out. See you there.' I don't know if they heard me. I don't know. But I went back out there. So I don't know if you could say I did it on my own or not."

Doctors ran him through a number of tests on the sideline. On the next offensive possession, with the Seahawks up 27-3, backup quarterback Trevone Boykin replaced Wilson.

Wilson was fitted for a knee brace by team doctors on the sideline. He then stood with his helmet in hand next to Carroll.

"I told him he better put that helmet down," Carroll said. "He's not getting it back. So we buckled it up. He wanted to get back in, even at the end."

For most of the second half, Wilson stood on the sideline with his knee wrapped in ice. Both Carroll and Wilson said the quarterback could have gone back in had the score been closer.

This is Wilson's second injury through the first three games. He suffered a right high ankle sprain in Week 1 but said that injury felt great Sunday.

Wilson completed 15 of 23 passes for 243 yards and a touchdown against the 49ers.

He has never missed a start in his NFL career.