KANSAS CITY, Mo. -- The Kansas City Chiefs ruled out three key contributors Wednesday in right guard Trey Smith , tight end Noah Gray and cornerback Chris Roland-Wallace ahead of their Thanksgiving Day matchup against the Dallas Cowboys .

A Pro Bowler last year, Smith will miss his second game this season after he sustained a sprained right ankle Sunday in the comeback win over the Indianapolis Colts . Mike Caliendo , a three-year veteran, is expected to replace Smith in the starting lineup.

"He knows everything [in the system]," offensive coordinator Matt Nagy said Tuesday of Caliendo. "To be able to step in and do the things he did, it's valuable for us."

Gray entered the NFL's concussion protocol when he sustained a concussion in the fourth quarter against the Colts whi

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