Williams, 33, a longtime run stuffer for the Ravens, has been unsigned since playing 13 games for Baltimore in 2021. Williams will likely be a rotational player on the Kansas City defensive line. He'll reunite with Chiefs defensive line coach Joe Cullen, Williams' position coach for five seasons with the Ravens. Pro Football Focus grades the Chiefs as the league's 17th best rush defense through Week 12. 

Williams came off the COVID-19 list one week ago but was still questionable for Tuesday night's game because of his ankle. An top-shelf run stopper, Williams contributes 30-35 weekly snaps up front. 

Williams was activated from the COVID-19 list on Tuesday, but his ankle isn't healthy yet. He hasn't practiced since November 15 and remains week to week. The Ravens run defense takes a hit with Williams and others sidelined. Baltimore's flight to Pittsburgh is set to take off on Tuesday ahead of the very rare Wednesday Day Football game.

QB Trace McSorley, CB Tavon Young and DB Khalil Dorsey have also been activated. Also dealing with an ankle issue, run-stopper Williams has not practiced since Nov. 15. If he's active, he probably won't see too many Week 12 snaps on Wednesday against the Steelers. Williams was averaging 35-40 before going down.