The actor recently confirmed that he will reprise his role as vampire Elijah in the climactic episode 'The Departed'.
"I can't say [what will happen]," Gillies told E! Online. "But at this stage, if you were Elijah, wouldn't you just want to get the hell out of a place causing so many problems?"
He added: "Elijah really has a thing for Elena (Nina Dobrev) if he's sticking around."
Gillies recently confirmed that he is still committed to The Vampire Diaries, despite signing up for a starring role in NBC medical drama Saving Hope.
"Fortunately we film at different times during the year," he explained. "I'm deeply indebted to what [The Vampire Diaries] has given me, but [Saving Hope] takes precedence."
The Vampire Diaries third season finale airs on Thursday at 8/7c on The CW. In the UK, the series airs on ITV2.