Kakko (upper body) is expected to see a specialist Friday to have his injury evaluated, per Alison Lukan of the Kraken Hockey Network on Thursday.
Kakko left Wednesday's preseason game due to the injury. He's expected to begin the season serving on the top six as long as he's healthy. If he ends up missing time, Jordan Eberle or 21-year-old Jani Nyman might fill that top-six spot for the duration of Kakko's absence.