All three players who were promoted will revert back to the practice squad without having to clear waivers on Monday.
Williams, 27, is a former third-round pick by the Cardinals in the 2016 NFL Draft out of Texas A&M. He was entering the final year of his four-year rookie contract when Arizona waived him with an injury designation.
The Giants signed Williams to a contract in August. He has appeared in two games for new York this season.
In 2018, Williams appeared in all 16 games for the Cardinals and recorded 15 total tackles, two pass defenses, and no interceptions to go along with 192 kickoff return yards.
Morris, 31, is a former sixth-round pick of the Redskins back in 2012. He played four seasons in Washington before signing a two-year, $3.5 million contract with the Cowboys in 2016 that included a $1 million base salary for the 2017 season.
Morris signed a one-year deal for the 2018 season with the 49ers and later returned to the Cowboys. From there, he had a brief stint with the Cardinals last year.
The Giants signed Morris to their practice squad a few months ago.