9:15 P.M. UPDATE
Dalvin Cook has returned to the game after leaving and being taken to the locker room with a groin injury. Cook missed one offensive series before returning, however he sat out the remainder of the game and is now scheduled to undergo an MRI on Monday.
Dalvin Cook caught a pass behind the line of scrimmage and as soon as he turned upfield to make a play he grabbed the inside of his upper-left leg and limped out of bounds.
Cook was immediately taken to the locker room for evaluation. NBC's Michelle Tafoya reported that Cook has a groin injury and his return is questionable.
Cook had 17 carries for 65 yards and a touchdown in the first half, helping the Vikings to a 13-0 lead on the road against the 4-0 Seahawks. He also had five receptions for 24 yards before leaving the game.
Alexander Mattison has replaced Cook in the backfield.
Seattle has since responded with a quick touchdown drive, culminating with a touchdown pass from Russell Wilson to tight end Will Dissly, cutting Minnesota's lead to 13-7 with 9:55 left in the third quarter.
This is a developing story.