The 20-year old Swedish midfielder has penned a new two-year contract with the option of a further year which will keep him at Craven Cottage until summer 2015.
"I'm very, very happy to have signed a contract extension with the Club," Kacaniklic told fulhamfc.com. "It's the perfect start for me ahead of the new season.
"I came back from my loan period at Watford last season and got some game time in the First Team and hopefully I'll be pushing for a place in the starting eleven this coming season.
"I'm aiming to start a lot more games next season and I'm going to work really hard to achieve my goals."