Fox might be adding another name to the Sirens roster for the fourth season of the “Batman” prequel television series “Gotham.” So far, the femme fatale group has only consisted of two members -- Barbara Kean (Erin Richards) and Tabitha Galavan (Jessica Lucas). As the second half of season three creeps towards its premiere date at the end of this month, clues have started to surface that the criminal duo may be a duo no more.

“Oh, I don’t want to spoil anything, but I think that is the plan,” Lucas said in an interview with Heroic Hollywood. “I love that they started it out in an unexpected way with Barbara and Tabitha because neither one of those characters are part of the [Gotham City] Sirens in the comic books. But I think there is room for growth, there is room for new members and I think it would be great to have some sort of girl gang going on next season. So I hope so, but I’m not sure yet!”

RELATED: Gotham: Bruce Wayne’s Journey to Batman Begins in New Teaser

Lucas is correct that neither Galavan (also known as the villainess Tigress) or Kean (the ex-wife of Gotham City Commissioner Jim Gordon) were members of the group in the original comic book run of “Gotham City Sirens,” the series that shares its name with the night club the two characters operate in “Gotham." Lucas doesn’t commit to any knowledge about expanding the Sirens in the show, but rumors have been percolating.

One of the most likely candidates to be added to the group is Selina Kyle (Camren Bicondova), the character who eventually becomes Catwoman. The addition would be fitting, as Catwoman was one of the three members of the Sirens in the comics; the other two being Poison Ivy and Harley Quinn. The third season of “Gotham” will see Kyle receive training from Tigress as she moves away from relying on Bruce Wayne.

RELATED: Gotham’s Ra’s Al Ghul Will Be ‘Ambiguous,’ Actor Teases

“I’m not sure, we haven’t really dived into that yet as of right now,” Bicondova said in a separate interview. “I think that eventually it will happen. Selina has been for the past however many months or years not consciously doing it, she has been kind of depending on Bruce in certain aspects and I think that for the rest of the season she isn’t looking for someone else to fill that spot, she is more realizing that she needs to fill that spot with herself and rely on herself. Wherever that mentality takes her by the end of the season is where we’ll find ourselves. “

Returning to Fox for the second part of its third season on April 24, “Gotham” is a production of Primrose Hill Productions developed by Bruno Heller and starring Ben McKenzie, Donal Logue, David Mazouz, Zabryna Guevara, Sean Pertwee, Robin Lord Taylor, Erin Richards, Camren Bicondova, Cory Michael Smith, Victoria Cartagena, Andrew Stewart-Jones and John Doman.