‘‘For him to come in on short notice and for him to come in and play center, it’s hard,’’ Nagy said (via Patrick Finley of the Chicago Sun-Times).

Taking Allen’s spot on the team is Johnson, who will ultimately provide Chicago with a bit more versatility. The 25-year-old has yet to play in a regular-season NFL game since going undrafted out of Rutgers in 2015, but he’s managed to catch on with several teams’ practice squads. Johnson has had stints with the Ravens, Browns, Cardinals, and Chiefs.