According to TV Week, Lincoln Younes, who plays the character, recently took a few weeks off from filming because he was busy working on the third run of drama series Tangle.
Dan Ewing - better known as the young actor's on-screen brother Heath - confirmed that a storyline has been created to explain Lincoln's disappearance from screens.
Speaking cryptically, Ewing told the magazine: "[Casey] won't be coming back the same teenager that he was. I think where he's been is going to harden him up…"
> Read our recent in-depth interview with Home and Away actor Dan Ewing
What do you think Home and Away bosses have in store for Casey? Share your thoughts via the usual box below!