Chicago worked out Hayes (undisclosed) on Tuesday, Kevin Fishbain of The Athletic reports.
The Panthers waived Hayes from injured reserve with an injury settlement before their regular-season opener, but he now appears to be back at full strength. As of about a week ago, Braxton Jones is set to spend the rest of the year on injured reserve with a knee injury, so it makes some sense that the Bears are exploring the free agent market for depth at tackle.