Career
He was drafted by the Titans in the second round of the 2005 NFL Draft. He played college football at Eastern Washington. Roos was named second-team All-GSHL as tight end at Mountain View High School in Vancouver, Washington after recording 18 receptions for 306 yards and three touchdowns as a senior under head coach Mike Woodward, now head coach of Westview High School in San Diego, California. Woodward describes Roos as very "humble and quiet".
He also made 40 tackles and two sacks as defensive lineman.
More remarkable was the fact that it was the first time in which Roos had played organized football in his life. Roos earned All-League honors for the Mountain View basketball team and also threw javelin for track & field team
He earned scholar-athlete honors three times in basketball, twice in track and once in football. As a student-athlete at Eastern Washington University, Roos played for the Eastern Washington Eagles football team
His fellow right tackle Paul Terrell was also an All-Big Sky Conference pick.
Initially projected as a late third rounder, Roos was selected with the ninth pick of the second round of the 2005 NFL Draft out of Eastern Washington. This made him the first Division I-Associate of Arts player to be drafted that season and the highest draft pick ever to come out of Eastern Washington. In 2008, Roos was elected to the Pro Bowl and was first team All Pro.
On April 26, 2008 Roos signed a six-year, $43 million extension with the Tennessee Titans.
On February 27, 2015, Roos retired from the NFL. He finished his career starting all 148 games he played. Even though born in Estonia, Roos does not speak Estonian, but his mother does.