Wagner was diagnosed with sprains to the MCL and PCL in his knee Monday and shouldn't require surgery, but he's expected to be sidelined for Sunday's game at Arizona, Ian Rapoport of NFL Network reports.
Wagner suffered the injury during Sunday's win over the Lions, though it was initially described as a sprained kneecap. Regardless, the 31-year-old is likely to be sidelined for the final game of the season, which would be his first absence since 2018 and only his second game missed since 2015. The Seahawks have already been eliminated from playoff contention, so he's likely seen the field for the final time this season. Assuming he's out Week 18, Wagner would finish the campaign with a career-high 170 tackles (93 solo) to go along with one sack, one interception and one forced fumble in 16 contests.