Dallas re-signed Morris back in July with starter Ezekiel Elliott holding out for a new contract. Morris was seen as insurance with rookie Tony Pollard and former undrafted free agent Jordan Chunn.
Morris burst into the league with three 1,000-yard seasons with the Washington Redskins before struggling in 2015. The Cowboys signed him prior to the 2016 season and he had success as a backup. In two years in Dallas, he played in 28 games with five starts.
Last season, Morris signed a one-year deal with the 49ers where he rushed for 428 yards and two touchdowns in 12 games, one being a start.