The 17-year-old striker was injured in training on Friday, and it has now been determined that it is a knee injury, AIK writes on its website.
Now rehabilitation awaits until the end of the year.
"Kevin is expected to be back in full training when the team begins pre-season in January 2027," AIK writes.
Filling has started 13 of 18 Allsvenskan matches and has scored two goals and provided five assists.
