Ashton Kutcher hinted that Charlie Sheen may appear on the Two and a Half Men series finale, and now CBS entertainment chief Nina Tassler didn't deny the speculation.

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When asked about the possibility during Monday's Television Critics Association, Tassler reportedly avoided the question.

"I can promise you there will be a lot of surprises," she said instead (via The Associated Press).

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Tassler also repeated the words of series executive producer Chuck Lorre who said the finale will be a "mystery sandwich."

Kutcher, who replaced Sheen on the show in 2011, appeared on The Ellen DeGeneres Show in December and said that he's "scared" of the finale after hearing how the story will unfold.

When DeGeneres asked if Sheen will return, Kutcher shrugged, adding, "If you're working on the Warner Bros. lot, if there's sirens, come save me."

Sheen, 49, was fired after eight years on the popular show because he rejected requests from Warner Brothers and CBS to enter rehabilitation. At the time, TMZ published Sheen's response to getting axed and it seemed the actor wasn't bothered.

"I'm thrilled," Sheen told the website. "It insulates me from having to redundantly see myself in the idiotic bowling shirt. Perhaps if Warner Bros. spent as much time and energy focusing on THEIR show, it wouldn't be such a steaming pile of a--."

However, when asked by Extra in October if he would return for the finale, Sheen said, "I would definitely do it."

Would you want Charlie Sheen to return for the series finale? Let us know in the comments below.

Tags: two and a half men