Marshall (back) has been ruled out for Friday's preseason matchup against the Giants, Augusta Stone of the Panthers' official site reports.
Head coach Frank Reich said the Panthers are "still evaluating" the extent of Marshall's back injury. The third-year player looks like the No. 4 wideout on the depth chart at the moment, so every remaining practice rep ahead of Week 1 will be crucial for any chance of Marshall handling a meaningful role in the season opener.