The Ottawa Redblacks re-signed defensive lineman Isaiah Mack to the practice squad on Friday, according to the CFL Transactions page.
Isaiah Mack is six foot one and weighs 305 pounds. The 30-year-old from Tunnel Hill, Georgia, was drafted by the Orlando Storm in the 2026 UFL Draft. In 2026, he made 24 tackles (15 solos, 9 assists), six tackles for loss, and 3.5 sacks in 10 games. In the UFL Semi-Finals against the D.C. Defenders, he made three tackles (1 solo, 2 assists). The Ottawa Redblacks signed Mack to the practice squad on September 7, 2026. The Redblacks released him on September 23, 2026.
The Tennessee Titans signed Mack as an undrafted free agent on May 10, 2019. He played a season and a half in Tennessee with 10 tackles (5 solos, 5 assists), one tackle for loss, 1.5 sacks, and one fumble recovery in 19 games, of which one was a start.
The Titans released him on November 2, 2020. The New England Patriots acquired him via waivers on November 3, 2020. He made one tackle (1 assist) in two games. He became a free agent after the 2020 season.
Mack spent time with the Denver Broncos and Pittsburgh Steelers before signing with the Baltimore Ravens on November 17, 2021. He played two seasons in Baltimore with six tackles (2 solos, 4 assists), two tackles for loss, and one sack in four games. The Ravens released him on December 26, 2022.
Mack also spent time with the New York Jets, Seattle Seahawks, Washington Commanders, and the Miami Dolphins. In 2024, Mack made eight tackles (4 solos, 4 assists) and one sack in three preseason games for Miami. The Dolphins released him on August 27, 2024.
The St. Louis Battlehawks signed Mack on December 4, 2024. In 2025, he made 12 tackles (6 solos, 6 assists), one tackle for loss, two sacks, and one forced fumble in three games.
Collegiately, Mack played four seasons at the University of Tennessee at Chattanooga (2015-18) with 222 tackles (110 solos, 112 assists), 41 tackles for loss, 21 sacks, two pass breakups, three forced fumbles, two fumble recoveries, and one blocked kick in 48 games for the Mocs.
He was named First Team All-SoCon in 2018, Defensive Player of the Year in 2018, Second Team All-SoCon in 2017, and First Team All-American by HERO Sports.com in 2018. His 41.0 career tackles for loss ranks third all-time at UTC behind Davis Tull (2011-14 – 60.0) and Keionta Davis (2013-16 – 43.0).
