Defending league co-champions Baylor and TCU had seven and five nominees, respectively.
Lambert was a no-brainer after emerging as a Groza Award finalist in 2014, when he made walkoff winners at Maryland and Texas Tech and set an NCAA single-season record with 16 field goals from 40 yards or beyond.
The other Players of the Year honors went to Baylor defensive end Shawn Oakman (Defense) and Oklahoma State running back Chris Carson (Newcomer).
Five Oklahoma players and three Oklahoma State players earned 2015 preseason All-Big 12 honors, as voted on by media members who cover the conference.
Clark’s selection marks the third-consecutive year where he has appeared on the Preseason All-Big 12 team.
Ross emerged last season as one of the most dynamic return men in the game.
Shepard caught 51 passes for 970 yards last season for OU, despite missing five regular-season games with an injury. Despite the missed time, Shepard ranked sixth in the Big 12 in receiving yards per game (80.8 avg.) and eighth in receiving yards while leading the Sooners in every major receiving statistic. His two touchdown returns tied for the most in the country in 2014, and his 31.2 average per kick return was third best in the nation. Robertson led the Big 12 in sacks in 2014. With 15.5 career sacks, Striker has more than any linebacker in OU history.
Like Striker, Sanchez was also placed on the All-Big 12 First Team by the coaches and media last season.
The Associated Press named Perine a third-team All-American selection in his debut season. Safety Karl Joseph was a defensive back previous year. Striker had six interceptions last season, which ranked second in the Big 12 and 13th nationally.