Update (Wednesday, 1:00 PM ET): Coach Andy Reid said Harrison Butker will "probably go this week" against the Broncos and will get most of the reps, according to Nate Taylor of The Athletic. Reid said there is a problem with Butker's technique, which is the reason for adding Tucker, and that there is nothing physically wrong with Butker, according to Matt Derrick of Chiefs Digest.
Update (Wed, 9:05 AM ET): Harrison Butker remains on the Chiefs' 53-man roster, according to Adam Schefter of ESPN and Tom Pelissero of NFL Network. Rapoport reported this is the first time Tucker has signed since serving a 10-game suspension for violating the league's Personal Conduct Policy, and that he is insurance for Butker. Pelissero reported Tucker went 30-for-30 in a Tuesday workout and is eligible to kick Sunday if the Chiefs need him.
The Chiefs are signing kicker Justin Tucker to their practice squad, according to Sam McDowell of the Kansas City Star. Ian Rapoport of NFL Network also reported the signing.