Both players were claimed off of waivers last week, but Houston received roster exemptions for them while they cleared the COVID-19 protocol.
Hilliard, 25, wound up signing on with the Browns as an undrafted free agent out of Tulane. He agreed to a three-year, $1.71 million contract with the Browns but was waived coming out of the preseason and re-signed to their practice squad.
The Browns eventually promoted Hilliard to their active roster before placing him on injured reserve in December. Cleveland brought him back on a one-year, exclusive rights deal this past April before waiving him on Monday.
In 2020, Hilliard has appeared in five games for the Browns and rushed for 48 yards on nine carries (5.3 YPC) to go along with one reception for two yards.
Fields, 24, wound up going undrafted out of Clemson back in April. He later agreed to a three-year, $1.755 million contract with the Chiefs.
Kansas City traded Fields to the Vikings coming out of the preseason for a 2021 seventh-round pick. However, Minnesota elected to waive him and has been on and off of their roster.
In 2020, Fields has appeared in two games for the Vikings and recorded one tackle.