Norrbottens-Kuriren is reporting  that Lightning prospect Johan Harju  suffered a possible knee injury during an on-ice practice session with Lulea for the upcoming SEL season. Apparently, Harju went to make a turn and felt a snap in the back of his knee. The team is being cautious with the possible injury and Harju left the ice in order to get a medical examination of the knee by a doctor. No further information about the extent of the injury are known at this time.
(Thanks to BP staffer sotnos for the translation help!)