Marlon Mack was placed on injured reserve with a torn Achilles days after joining the Arizona Cardinals.
Mack was helped off the field during a training camp practice on Tuesday. He signed a one-year deal with the Cardinals on August 4.
Mack, a fourth-round pick by the Indianapolis Colts in 2017, scored 10 touchdowns and gained 908 rushing yards while playing in 12 games during the 2018 season. He followed that with a 1,091-yard, eight-TD performance through 14 games in 2019.
Mack, 27, suffered a torn Achilles tendon in 2020 and struggled to regain his top form. He played six games for the Denver Broncos last season, gaining 84 yards on 16 carries.
The Cardinals' depth at running back behind starter James Conner includes Ty'Son Williams, Keaontay Ingram, Corey Clement and rookie Emari Demercado.
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