LONDON -- The Minnesota Vikings placed center Ryan Kelly on injured reserve Saturday, meaning he will miss at least four games after suffering two concussions in the first month of the season.

The decision is a long-term blow for an offensive line that will be missing a total of three starters for Sunday's game against the Cleveland Browns .

Kelly had previously sustained at least three concussions in his NFL career. He went into the NFL's concussion protocol during the Vikings' second game of the season and missed the following game. He returned last week against the Pittsburgh Steelers but went back into the protocol at halftime.

The Vikings signed Kelly to a two-year, $18 million free agent contract in March as part of their effort to stabilize the interior of their offensive

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