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.
Pruitt (knee) has been ruled out of Sunday's game against the Eagles.
Pruitt hasn't practiced since suffering a knee injury in Week 5, so he'll remain sidelined for Sunday's game in Philadelphia. That absence will leave the Vikings with one less tight end option behind Kyle Rudolph and Rhett Ellison.
Treadwell (thumb) is inactive Sunday against the Eagles.
Treadwell was active for each of the Vikings' last two contests, but was limited with a thumb injury in practice this week. Stefon Diggs, Adam Thielen, Charles Johnson and Cordarrelle Patterson will make up Minnesota's wideout corps.
Heinicke (ankle) returned to practice Wednesday after a lengthy recovery stemming from July foot surgery, Matt Vensel of the Star Tribune reports.
Heinicke has a three-week window for the Vikings to either activate him from the reserve/NFI list, waive him, or send him to IR. If he's activated he'll likely serve as the No. 3 option at quarterback behind starter Sam Bradford and veteran backup Shaun Hill.