The Denver Broncos reacted quickly to the news that starting center Dan Koppen is out for the season with a torn anterior cruciate ligament.

They agreed to terms with free agent center Steve Vallos today, pending a physical.

Vallos has played in 44 games with nine starts, including stints with the Seattle Seahawks, Cleveland Browns, Philadelphia Eagles and Jacksonville Jaguars.

He has allowed just 1.25 sacks in his career and has been called for just two penalties according to STATS Inc.

He was selected by the Seahawks in the seventh round the 2007 NFL draft.

Vallos played collegiately at Wake Forest and was an All-American and All-Atlantic Coast Conference selection as a senior.

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Aaron Wilson covers the Ravens for The Baltimore Sun.