The Seattle Seahawks placed starting center Jalen Sundell on injured reserve Saturday, which means he’s required to miss at least the next four games.

The Seahawks also activated guard Christian Haynes from IR and elevated linebacker Patrick O’Connell from the practice squad for Sunday’s NFC West showdown against the Los Angeles Rams.

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Sundell, an undrafted second-year center out of North Dakota State, injured his knee in the second quarter of this past Sunday’s blowout win over the Arizona Cardinals. He exited the game and was replaced by backup Olu Oluwatimi.

On Monday, Seahawks head coach Mike Macdonald said Sundell would likely miss “multiple weeks” and acknowledged that IR was a possibility, but said the injury isn’t expected to be s

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