Ferentz was activated from the reserve/COVID-19 list Wednesday, Phil Perry of NBC Sports Boston reports.
Ferentz returned to practice Wednesday and will play in Sunday's game versus the Bills. He started one game before landing on the COVID-19 list, but with David Andrews (thumb) back in the fold, Ferentz likely will return to a backup center role.
The Patriots placed Ferentz on the reserve/COVID-19 list Friday, per the NFL's official transactions log.
Ferentz has suited up and started one game this season, but now he'll be shut down until he can clear the league's COVID-19 protocols.
Ferentz signed a contract with the Patriots on Saturday, Field Yates of ESPN reports.
Ferentz has been on the Patriots' practice squad since falling victim to roster cutdowns in September. The 29-year-old provides interior depth for the offensive line with starting right guard Shaq Mason (calf) currently sidelined.
Ferentz signed a contract with the Patriots on Thursday.
Ferentz spent the last two seasons with Denver, where he appeared in 21 regular-season games and one postseason game. Now with New England, the 27-year-old offensive lineman will look to make the team as a depth and special teams player.
Ferentz was waived Wednesday by the Broncos, Nicki Jhabvala of The Denver Post reports.
Ferentz signed a one-year free-agent tender with the Broncos in April, but was let go Wednesday in order to make room on the roster for newly-signed draft picks De'Angelo Henderson and Chad Kelly. The center has spent his career in a backup role, and will presumably look to continue doing so elsewhere.