Harper was promoted to the active roster just prior to the 49ers' September 12 matchup against the Los Angeles Rams. He was waived the following day and then resigned to the practice squad on September 15.
Martin was signed by the 49ers on September 27 and appeared in one game this season. He only played on special teams during that appearance, returning two kickoffs for 37 yards.
Frazier was one of two receivers that the 49ers worked out recently, per Adam Caplan of ESPN. The other was Antwan Goodley.
Frazier was signed as an undrafted free agent by the Denver Broncos in May and then waived by the team on September 3. He joined the Bronco's practice squad in October but was waived on November 4. Frazier played college football at the University of Memphis.
Related News
More San Francisco 49ers News
-
49ers roster moves: D-lineman and O-lineman signed to one-year deals
The San Francisco 49ers have signed defensive lineman Victor Dimukeje and reunited with offensive lineman Nick Zakelj. Both join the team on one-year deals. To make room on the roster, the 49ers released running back Khalil Herbert and offensive lineman Kion Smith. ESPN's Adam... -
49ers roster moves: RB Zamir White among 3 signed; 3 players waived
ESPN's Adam Schefter reported that the San Francisco 49ers signed former Las Vegas Raiders running back Zamir White to a one-year deal, which the team quickly confirmed. He worked out for the 49ers this week. Former Raiders RB Zamir White is signing with the 49ers.— Adam... -
49ers announce roster moves ahead of joint practice with Chargers
The San Francisco 49ers have signed defensive lineman Evan Anderson to a one-year deal. To make room on the roster, the team waived/injured defensive lineman Titus Leo. The 49ers Communications staff provided the following rundown. Anderson (6-3, 326) originally entered the... -
49ers injury updates: Kurtis Rourke taken to the hospital, other news after Titans game
San Francisco 49ers quarterback Kurtis Rourke was playing well in Thursday night's preseason opener against the Tennessee Titans. However, he was forced to leave the game in the second quarter with a rib injury and was replaced by Adrian Martinez. Head coach Kyle Shanahan... -