Tkachuk (undisclosed) left Tuesday's preseason game versus the Hurricanes for precautionary reasons, Rob Darragh of the Panthers' official site reports.
Head coach Paul Maurice said Tkachuk may be on the ice Wednesday, further suggesting the injury isn't a major concern. Tkachuk has already played in two preseason games, so he won't be eligible to suit up again until the regular-season opener next Tuesday against the Hurricanes.