Keelan Johnson, a rookie safety signed off the Eagles' practice squad this week, is primed to make his NFL debut on Sunday against the Bears.
With backup safeties Kurt Coleman and Colt Anderson each ruled out, according to the team's official injury report Friday, Johnson will likely serve as the No. 4 safety and play on special teams.
He and Patrick Chung are expected to be the backups behind Nate Allen and rookie Earl Wolff, who will play for the first time since injuring his knee against the Packers on Nov. 10 at Lambeau Field. Wolff, who practiced all week, is listed as probable.
Also probable is Brandon Boykin, who sustained a concussion in Sunday's loss to the Vikings but was medically cleared for practice on Thursday. Boykin, the second-year slot corner, will see plenty of action against the Bears' spread passing attack.
Other probables are linebackers Najee Goode (hamstring) and Mychal Kendricks (knee) and wide receiver Brad Smith (hamstring).
Johnson, a former Arizona State standout, spent his first 15 weeks on the practice squad. Last year, he was named first-team All Pac-12 after recording five interceptions, 11th-most in the FBS.
He went undrafted and signed with the Dolphins, but was waived at the roster cutdown date and then signed to the Eagles' practice squad.