The San Francisco 49ers announced they have placed C Marcus Martin on the Injured Reserve List and promoted RB Raheem Mostert to the team's active roster.

Mostert (5-10, 197) originally signed with San Francisco's practice squad on November 28, 2016. This season, Mostert was waived by Cleveland on September 4, 2016, signed to the New York Jets practice squad on September 6 and later released from the Jets on September 12. He was signed to the Chicago Bears practice squad on September 13 where he spent time between the practice squad and active roster, appearing in two games with Chicago prior to being waived on October 21.

Mostert entered the NFL with the Philadelphia Eagles as an undrafted free agent in 2015. After signing with Philadelphia's practice squad on September 6, 2015, he was signed to the Miami Dolphins active roster on September 15, 2015. Mostert went on to appear in one game with Miami, seven games with the Baltimore Ravens and three games with the Cleveland Browns in 2015, where he returned a total of 19 kickoffs for 530 yards (27.9 average).

A 24-year-old native of Daytona Beach, FL, Mostert attended Purdue University where he appeared in 44 career games, spending time at both wide receiver and running back. He finished his career with 759 rushing yards and six touchdowns on 136 carries and 19 receptions for 122 yards and also set school records for total kickoff return yards (2,289) on 88 career returns. As a freshman in 2011, he led the NCAA FBS in kickoff return average (33.5 yards), including four returns of 71 yards or more.

Mostert will wear number 31.

Martin (6-3, 321) appeared in five games (two starts) this season with the 49ers.