The San Francisco 49ers announced they have signed RB Pierre Thomas to a one-year deal. In order to make room on the roster, the team placed RB Reggie Bush on the Injured Reserve List. The team also signed CB Chris Davis to the practice squad, filling the spot vacated by DL Kaleb Ramsey.Statement by an NFL spokesperson:

"Kaleb Ramsey of the San Francisco 49ers has been suspended without pay for the team's next four games for violating the NFL policy on performance enhancing substances."

Thomas (5-11, 215) originally signed as an undrafted free agent with the New Orleans Saints in 2007. Throughout his eight-year career, he has played in 105 games (38 starts) and registered 818 carries for 3,745 yards and 28 touchdowns as well as 327 receptions for 2,608 yards and 12 touchdowns with the Saints.

A 30-year-old native of Chicago, IL, Thomas attended the University of Illinois, where he appeared in 40 games, and finished his career with 2,545 yards rushing (5.6 average) and 20 touchdowns along with 57 receptions for 411 receiving yards and three touchdowns.

Bush (6-0, 205) signed with the 49ers as a free agent on March 18, 2015. He appeared in five games this season and registered eight carries for 28 yards.

Davis (5-10, 201) originally signed as an undrafted free agent with the San Diego Chargers on May 13, 2014. Last season, he saw action in 12 games (one start) and registered 12 tackles, one forced fumble and one pass defensed to go along with 19 kickoff returns for 476 yards (25.1 average) and two tackles on special teams. He was waived/injured on September 1, placed on the Injured Reserve List the following day and was waived from the Injured Reserve List on October 26.

A 24-year-old native of Birmingham, AL, Davis attended Auburn University, where he appeared in 45 games and finished his career with 194 tackles, 24 passes defensed in four seasons with the Tigers (2010-13).

Ramsey (6-3, 285) was the first of the 49ers two, seventh-round draft picks (243rd overall) in 2014 out of Boston College. He was placed on the Reserve/Physically Unable to Perform List on August 25, 2014 where he spent the entire season. He was waived by the team on September 5, 2015 and signed to the team's practice squad the following day.

I am excited for this opportunity & want to thank the @49ers org for bringing me on board. Let's get to work! pic.twitter.com/6QjC4FMFxR — Pierre Thomas (@Pierre_Thomas) November 3, 2015