Johnson left Sunday's 17-10 loss to New England with the head injury.
Philadelphia replaced Johnson with veteran swing tackle Halapoulivaati Vaitai on Sunday, but won't approach a Johnson absence in the same manner this weekend. Rookie tackle Andre Dillard has been practicing on the right side all week to get up to speed in time to start in place of Johnson against the Seahawks.
Dillard, the 22nd overall pick of the 2019 draft, has already replaced one All-Pro tackle in his nascent career, stepping in for the injured Jason Peters at left tackle. The left side is the more natural fit for Dillard, at least in terms of comfort and experience, as he was an excellent left tackle at Washington State. But with Peters healthy and entrenched on the left side, and the Eagles in dire straits on the right side without Johnson, it's become the rookie's responsibility to flip everything he knows about left tackle to the right side.
There might be some good news outside of the offensive line in Philadelphia. Coach Doug Pederson said Friday receivers Nelson Agholor (knee) and Alshon Jeffery (ankle) are improving and seem to be headed in the right direction ahead of Sunday's game. Meanwhile, running back Jordan Howard (shoulder) hasn't yet been cleared for contact, Pederson added, though he couldn't go into further detail. All three players are listed as questionable.
Elsewhere in injury news:
Coach Pat Shurmur confirmed Friday tight ends Evan Engram (foot) and Rhett Ellison (concussion) will not play Sunday.
»Detroit Lions coach Matt Patricia said quarterback Matthew Stafford (hip, back) will miss his third consecutive game Sunday.
»NFL Network Insider Ian Rapoport reported the Pittsburgh Steelerswill be without running back James Conner (shoulder) on Sunday versus the Bengals. Wide receiver JuJu Smith-Schuster (knee, concussion) is not expected to play either, Rapoport added. The team confirmed neither player will be available. Cornerback Artie Burns (knee) is also doubtful.
»Dallas Cowboys coach Jason Garrett told reporters linebacker Leighton Vander Esch (neck) will not play Sunday versus the Patriots. "We don't think it's career threatening," Garrett said. "We think at some point it he will be back. We think it needs to calm down. Want to give it time to do that. Hopefully, we can get him back real soon."
»Cleveland Browns defensive end Olivier Vernon (knee) did not practice Friday and will miss Sunday's game versus the Dolphins. It would be his third absence in a row. Cleveland is already without defensive linemen Myles Garrett and Larry Ogunjobi because of suspension. Linebacker Joe Schobert is listed as questionable.
Browns coach Freddie Kitchens said tight end David Njoku (wrist) will not come off injured reserve this week.
»Green Bay Packers offensive lineman Cole Madison tore his ACL in practice this week and is out for the season, Rapoport reported, per a source. Green Bay coach Matt LaFleur described the injury as significant and said his heart breaks for him.
»The Cincinnati Bengals listed wide receiver Stanley Morgan, who did not practice all week, as questionable. Wide receiver Auden Tate (concussion) is also questionable. Wide receiver A.J. Green (ankle) and tight end Drew Sample (ankle) have been ruled out.
»Oakland Raiders defensive back Lamarcus Joyner (hamstring), who did not practice this week, is listed as questionable.
Seattle placed tight end Ed Dickson (knee) on injured reserve.
»San Francisco 49ers tight end George Kittle (knee, ankle) and wide receivers Deebo Samuel (shoulder) and Emmanuel Sanders (ribs) are listed as questionable for Sunday's game against the Packers. Running back Matt Breida (ankle) and kicker Robbie Gould (quad) are doubtful. Defensive end Dee Ford (hamstring) has been ruled out.