Lewis, 26, was taken in seventh round of the 2012 NFL Draft by the Lions. Last year, he was suspended for four games after he violated the league’s policy on performance-enhancing substances.
Lewis still has one year remaining on his four-year, $2,157,848 rookie contract and will make a base salary of $660,000 for the 2015 season.
His year ends with him appearing in two games and recording just two tackles.
Thompson, 24, signed on with the Lions as a free agent back in April. He was unable to make the final 53-man roster coming out of the preseason, but he was later added to the team’s practice squad.