The 49ers Communications team provided the following rundown.
Manning (6-2, 294) originally entered the NFL in 2023 after signing with the San Francisco 49ers as an undrafted free agent on May 2, 2023. He was waived by the team on August 29, 2023 and claimed by the Arizona Cardinals the following day. After being inactive in each of the team's first four games, Manning was waived by Arizona on October 2, 2023.
A 24-year-old native of Glendale, AZ, Manning attended the University of Hawaii (2018-22) where he appeared in 62 games (60 starts) and finished his career as a First-Team All-Mountain West selection.
McNichols (5-9, 205) was originally drafted by the Tampa Bay Buccaneers in the fifth round (162nd overall) of the 2017 NFL Draft. Throughout his five-year NFL career with the Buccaneers, San Francisco 49ers (2017), Indianapolis Colts (2018), Jacksonville Jaguars (2019) and Tennessee Titans (2020-21), he has appeared in 34 games and registered 90 carries for 364 yards (4.0 average) and one touchdown on the ground to go along with 40 receptions for 295 yards (7.4 average) and one touchdown through the air. He has also appeared in one postseason contest where he finished with one carry for four yards.
McNichols spent the 2022 season on the Pittsburgh Steelers practice squad. He signed a one-year deal with the 49ers on August 8, 2023, before being released by the team on August 29. He has also spent time on the Denver Broncos (2018), Chicago Bears (2019) and 49ers (2023) practice squads.
A 27-year-old native of Long Beach, CA, McNichols attended Boise State University where in three seasons (2014-16) he appeared in 34 games (25 starts) and registered 571 rushes for 3,205 yards (5.6 average) and 44 touchdowns as well as tallying 103 receptions for 1,089 yards and 11 touchdowns. On special teams, he returned 28 kickoffs for 554 yards (19.8 average). As a junior in 2016, he earned Second-Team All-Mountain West honors for the second-consecutive season after rushing for 1,709 yards and 23 touchdowns on 314 carries.
Colletto (6-3, 237) and Davidson (6-3, 303) both originally signed to the team's practice squad on August 30, 2023.
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