Pittman (right leg) didn't practice Tuesday, Alan Saunders of SteelersNow.com reports.
DK Metcalf (undisclosed) was also sidelined, according to Aaron Rodgers. As a result, there's a decent chance that both wideouts will be held out of Thursday's preseason opener against the Packers, but there's been nothing so far to suggest that either player's Week 1 availability is in jeopardy.