RELATED
The 49ers Communications staff provided the following rundown.
Allen (6-3, 240) originally entered the NFL after signing with the Denver Broncos as an undrafted rookie free agent on May 10, 2024. Following his release from Denver on August 14, 2024, he spent time with the Memphis Showboats and the Arlington Renegades of the United Football League (UFL). In 2025 with the Showboats, he appeared in 10 games (nine starts) and registered 27 tackles, 1.5 sacks, one tackle for loss, and one forced fumble.
A 25-year-old native of Humble, TX, Allen attended the University of Memphis for five seasons (2019-23), where he appeared in 60 games and registered 150 tackles, 13.0 sacks, five passes defensed, three fumble recoveries, two forced fumbles, and one interception, and was named Second-Team All-AAC in 2023.
Jackson (6-2, 254) originally signed with the team on January 2, 2025.
Related News
More San Francisco 49ers News
-
49ers signing WR Javon Baker to the practice squad
The San Francisco 49ers are adding depth at wide receiver, signing Javon Baker to the practice squad, per ESPN's Jeremy Fowler. Baker was one of several players who worked out for the team last week. Wide receiver Javon Baker is signing with the 49ers practice squad, per... -
49ers claim linebacker off waivers, place Ben Bartch on IR
The San Francisco 49ers have claimed linebacker Garret Wallow off waivers from the Denver Broncos. To make room on the roster, the team placed offensive lineman Ben Bartch on the injured reserve list. Bartch suffered a foot injury in Week 13 against the Cleveland Browns. Last... -
49ers continue D-line overhaul in ESPN's 2026 NFL mock draft
The San Francisco 49ers invested three picks in the 2025 NFL Draft to overhaul their defensive line, and ESPN's Field Yates projects that effort will continue next year. In his latest 2026 NFL mock draft, Yates projects head coach Kyle Shanahan and general manager John Lynch... -
49ers' Brock Purdy may have a request for Mac Jones, explains sideline arm brace
Last year, San Francisco 49ers quarterback Brock Purdy surprised his offensive linemen with Toyota vehicles—an extravagant gesture considering he had not yet signed his lucrative contract extension. Of course, Purdy was an endorsement partner for Toyota at the time, meaning...