Dixon left Saturday's preseason matchup with an apparent chest injury and is questionable to return, Jonathan Jones of the Charlotte Observer reports.
In his NFL debut last week, Dixon tallied three tackles against Baltimore. The Washington product has taken reps at both cornerback and safety for Carolina in the early going, but with a lot of uncertainty surrounding Dixon and his injury, it remains to be seen if he'll be able to squeak onto the roster by preseason's end.
Johnson (Achilles) was placed on the Panthers' reserve/NFI list on Monday, Steve Reed of the Associated Press reports.
Johnson also began training camp on the active/NFI list after undergoing offseason surgery to repair an Achilles injury suffered last season with the Patriots. Although no timetable was provided for his return, Johnson could theoretically resume playing after the first six weeks of the regular season.
Hall (ankle) has been ruled out for Thursday's matchup against the Packers, NFL Network's Mike Garafolo reports.
News came earlier in the week that Hall's ankle injury would not require surgery, but the rookie cornerback will be out for at least Week 7's tilt, with his next opportunity to return coming Week 8 on Monday night against the Vikings. Sherrick McManis and Cre'von LeBlanc could be in line for additional reps when the Packers deploy multiple-receiver offensive sets, but their roles likely won't be affected too severely if Tracy Porter (knee) and Bryce Callahan (hamstring) are able to play.
Ferguson has been handed a four-game suspension for a violation of the NFL's policy on performance-enhancing substances, Jeff Dickerson of ESPN Chicago reports.
After notching three tackles in four games, Ferguson was placed on season-ending injured reserve in October due to a nagging knee injury. Thus, his ban won't kick in until he's healthy enough to take the field during the 2016 campaign.