The Chicago Bears updated their preseason depth chart on Tuesday. View it in full below, courtesy of a Tweet by Zach Zaidman of the Bears Radio Network.

Although the depth chart is still unofficial, some interesting developments can be gleaned from it. For example, right tackle Jordan Mills is listed with the first team after being demoted last week. Charles Leno, who briefly relieved Mills, is back on the second team.

The only rookie in the starting lineup is fifth-round draft pick Adrian Amos, who's paired with Antrel Rolle as the Bears' first-team safeties. Brock Vereen and Ryan Mundy, both second-teamers, seem to be falling behind in that position battle.

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Three key starters -- wide receiver Alshon Jeffery (calf), left tackle Jermon Bushrod (back) and outside linebacker Pernell McPhee (chest) -- are currently dealing with injuries. On top of that, first-team nose tackle Jeremiah Ratliff has been suspended for the first three games of the 2015 season.

(h/t @ZachZaidman)