Johnson (back) didn't practice Wednesday, Teresa Varley of the Steelers' official site reports.
Per coach Mike Tomlin, Johnson took a direct blow to his back during Sunday's 38-29 win against the Eagles. That said, the Steelers have optimism that the wideout -- who's been getting routine days off at practice this season -- will be fit to play this weekend against the Browns. A return to the practice field in any capacity Thursday would support that notion.