[4] He played four seasons with the Vikings, appearing in 59 games (10 starts) and recording 143 tackles, 1.5 sacks, and a forced fumble.
However, on August 31, 2008, Thomas was released by the 49ers to make room for linebacker Ahmad Brooks.
Thomas was signed by the Vikings on October 13, 2008, when offensive tackle Drew Radovich was placed on injured reserve.
[5] Thomas signed with the California Redwoods of the United Football League in 2009 and recorded 35 tackles.
Thomas was signed by the San Diego Chargers on January 5, 2010, after linebacker James Holt was placed on injured reserve.