Head coach Bob Stoops announced several changes to the University of Oklahoma football roster on Wednesday in anticipation of the team's first fall practice on Friday.Senior center Ben Habern has opted to conclude his playing career due to lingering neck and back concerns. Habern started 30 contests at center during his career with the Sooners. An arm injury limited the Argyle, Texas, native to six starts a year ago after he opened all 14 games in 2010, earning All-Big 12 honorable mention honors from the Associated Press in the process. He was named to the All-Big 12 Freshman Team by ESPN.com in 2009.

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