In addition to the team exercising the fifth-year option of defensive lineman Arik Armstead, the San Francisco 49ers have announced a number of additional roster moves.
The 49ers have waived the following players:
LB Jimmie Gilbert
LB Boseko Lokombo
DB Dexter McCoil
LB Donavin Newsom
CB Channing Stribling
The 49ers also announced the signings of the following undrafted free agents to three-year contracts:
| Name | Pos | Ht | Wt | School |
| Steven Dunbar | WR | 6-3 | 202 | Houston |
| Ross Dwelley | TE | 6-5 | 240 | San Diego |
| Jack Heneghan | QB | 6-4 | 230 | Dartmouth |
| Alan Knott | OL | 6-4 | 290 | South Carolina |
| Jamar McGloster | OL | 6-7 | 309 | Syracuse |
| Niles Scott | DL | 6-3 | 280 | Frostburg State |
| Terrell Williams | S | 6-4 | 212 | Houston |
The 49ers Communications department provided the following breakdowns for each player.
Appeared in 51 games (38 starts) during his four-year career at Houston. Registered 180 recepts. for 2,430 yds. and 11 TDs while adding 3 KORs for 51 yds. As a senior in 2017, started all 12 games and registered 76 recepts. for a team-high 1,070 yds. and 3 TDs and earned All-American Athletic Conference Honorable Mention honors. In 2016, started all 13 games and recorded 53 recepts. for 692 yds. and 5 TDs. As a sophomore, appeared in all 13 games (12 starts) and totaled 31 recepts. for 382 yds. and 3 TDs along with 1 KOR for 37 yds. In 2014, appeared in 13 games (1 start) and recorded 20 recepts. for 286 yds. and 2 KORs for 14 yds. Attended Archbishop Rummel (Metairie, LA) HS, where he had 51 recepts. for 695 yds. and 5 TDs as a senior, 31 recepts. for 659 yds. and 5 TDs as a junior in 2012 and 6 recepts. for 134 yds. and 2 TDs his sophomore year. Born 12/19/95 in Metairie, LA.
TE Ross Dwelley, San Diego
Appeared in 47 games (44 starts) and totaled 197 recepts. for 2,305 yds. and 26 TDs during his five years at San Diego. As a senior, earned First-Team All-Pioneer Football League honors. Appeared in all 12 games (10 starts) and registered 50 recepts. for 663 yds. and 10 TDs. In 2016, started all 11 games and recorded a team-high 70 recepts. for 843 yds. and 10 TDs to earn Second-Team All-Pioneer Football League honors. In 2015, appeared in 12 games (11 starts) and earned Second-Team All-Pioneer Football League honors after totaling a team-high 54 recepts. for 580 yds. and 3 TDs. Made starts in 12 games in 2014 and notched 23 recepts. for 219 yds. Redshirted in 2013. Attended Oak Ridge (El Dorado Hills, CA) HS, where he registered 43 recepts. for 568 yds. and 5 TDs. Born 1/26/95 in Sonora, CA.
QB Jack Heneghan, Dartmouth
In four years at Dartmouth (2014-17), played in 22 games (19 starts) and completed 437 of 717 atts. for 4,900 yds. and 28 TDs. Rushed 126 times for 389 yds. and 4 TDs. In 2017, made 10 starts and completed 185 of 293 atts., for 2,136 yds. and 17 TDs to go along with 51 rushes for 162 yds. and 1 TD. Appeared in 10 games (9 starts) as a junior in 2016, where he ranked second in school history in comps. (247) and atts. (414) and third in yds. (2,725) in a single season, to go along with 11 TDs. Ran for 249 yds. and 3 TDs on 73 rushing atts. In 2015, appeared in 2 games and completed 5 of 10 atts. for 39 passing yds. As a freshman in 2014, appeared in 3 games for the school's junior varsity program where he finished with 64 comps. on 90 atts. for 847 yds. and 8 TDs. Attended Menlo (Atherton, CA) School, where he passed for 2,974 yds. and 37 TDs. Born 2/13/96 in Atherton, CA.
OL Alan Knott, South Carolina
Spent five years at South Carolina and appeared in 49 games (42 starts). Made 13 starts at center as a fifth-year senior in 2017. In 2016, started 12 of 13 games played. As a redshirt sophomore in 2015, appeared in 10 games (9 starts) at center. In 2014, appeared in all 13 games (8 starts). Redshirted as a true freshman in 2013. Attended Sandy Creek (Tyrone, GA) HS, where he was named first-team Class AAAA all-state by the Atlanta Journal Constitution and by the Georgia Sportswriters Association. Born 12/16/94 in Tyrone, GA.
OL Jamar McGloster, Syracuse
Spent five years at Syracuse and appeared in 30 games (24 starts). Made 12 starts at right tackle as a fifth-year senior in 2017, where he aided a Syracuse offense that ranked third in the ACC in total offense (456.3 YPG) and second in passing (294.8 YPG). In 2016, started all 12 games at right tackle. As a redshirt sophomore in 2015, appeared in 3 games at right tackle. In 2014, appeared in 3 games in his first game action. Redshirted as a true freshman in 2013. Attended St. Anthony (Jersey City, NJ) HS, where he helped lead the Friars to an 8-3 record and the NJSIAA Group 1 Non-Public semifinals as a senior. Born 6/4/95 in Newark, NJ.
Played in 43 games (38 starts) in four years at Frostburg State and registered 150 tackles, 43.0 TFLs, 25.5 sacks, 1 FF, 3 FRs and 2 PDs. In 2017, earned First-Team Associate Press Little All-America Division III honors and was named the D3football.com All-East Region Defensive Player of the Year. Started all 13 games and tallied 51 tackles, 16.5 TFLs, 10.0 sacks, 1 FF, 1 FR and 2 PDs. As a junior, earned Second-Team All-America honors from the American Football Coaches Association and was named Second-Team All-NJAC. Started all 11 games in which he appeared at recorded 55 tackles, 17.5 TFLs, 9.0 sacks and 1 FR. In 2015, played in 10 games (8 starts) and notched 24 tackles, 2.5 TFLs and 2.5 sacks. As a freshman, played in 9 games (6 starts) and registered 20 tackles, 6.5 TFLs, 4.0 sacks and 1 FR. Attended Elkton (MD) HS and earned second-team all-state honors as a senior. Also was an All-Upper Chesapeake Bay Athletic Conference honoree and Defensive Player of the Year as a junior and senior. Born 9/30/95 in Elkton, MD.
S Terrell Williams, Houston
Played in 25 games (17 starts) in two seasons with Houston and registered 95 tackles, 4 INTs, 1 FR and 7 PDs. In 2017, started all 12 games and notched 66 tackles, 4 INTs, 1 FR and 7 PDS. As a junior, played in all 13 games (5 starts) and tallied 29 tackles. Attended Northeast Oklahoma A&M for two seasons (2014-15). In 2015, earned First-Team All-SWJCFC honors as he recorded 51 tackles, 2 INTs and 4 PDs. As a freshman, registered 24 tackles, 1 INT and 2 PDs. Attended Lawton (OK) HS and had 56 tackles and 5 INTs as a senior. Born 6/29/96 in Lawton, OK.
