Martin signed with the 49ers in September after being released by the Patriots when they cut their roster at the end of the preseason. He didn’t play any offensive snaps and returned two kickoffs for 27 yards.
Harris (5-7, 206) was released by the 49ers on September 12, 2016 after re-signing with the team on September 5, 2016.
Harper (5-11, 185) was elevated to the team’s active roster on September 12, 2016 from the team’s practice squad and was active Week 1 against the Los Angeles Rams. He originally signed on the 49ers practice squad on September 5, 2016.
Pro Football Talk
Sep 12, 2016 · 9:10 PM EDT
Wide receiver Chris Harper didn’t make the initial 53-man roster in New England, but he will be on a roster for the first week of the regular season.
Harper signed to the 49ers practice squad after being waived by the Patriots and the Niners announced on Monday afternoon that they have promoted him to the active roster ahead of their game against the Rams. Running back DuJuan Harris was released to free up the spot.
The author didn't really say his opinion on who could emerge in that spot, but did say Carter and Harper can be placed on the practice squad while Dobson and Martin cannot. The author did say Carter is in the Edelman/Amendola mold which could provide some insurance since both are currently hurt.