He played college football for the Wake Forest Demon Deacons, earning first-team All-American honors in 2006.

Vallos has also played for the Cleveland Browns, Philadelphia Eagles, Jacksonville Jaguars, and Denver Broncos.

[3] As a fifth-year senior, Vallos helped lead the Demon Deacons to the 2006 ACC Championship, where they defeated Georgia Tech by a score of 9–6.

[7] After Chris Spencer suffered a season-ending injury in December 2008, Vallos started at center in his place.

[12] He was re-signed by the Philadelphia Eagles on September 18, 2012, to fill the spot vacated by center Jason Kelce, who was placed on season-ending injured reserve due to a knee injury.

On July 28, 2013, Vallos was signed by the Denver Broncos to help replace Dan Koppen, who tore his ACL during practice earlier the same day.