Counter-Strike creator and former Valve employee Minh "Gooseman" Le has let slip that both Half-Life 3 and Left 4 Dead 3 are in development.

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"I don't think I can talk about that, to be honest, but I think it's kind of public knowledge, that people know that it is being worked on," Le said of the long-fabled Half-Life 3, speaking on podcast goRGNtv . "I guess I could say that I did see something that looked kinda like in the Half-Life universe. And I mean it wouldn't surprise anyone if I said they're doing it, they're working on it, yeah. So to go on a limb I'd say I did see some concept art for Half-Life 3."Le also confessed to being "really excited" about a new, unannounced entry in the Left 4 Dead series. "I saw it, it looks great. I was really excited when I saw that, I was like 'wow, this looks great'."Let's hope Le doesn't get into any trouble; he says that these revelations seem "like old news by now," but the famously tight-lipped Valve has never acknowledged the existence of HL3 or L4D3, sequels to two of the most popular series in PC gaming.Last year, mentions of both Half-Life 3 and Left 4 Dead 3 were found in Valve documentation . Valve head Gabe Newell has said, however, that he wants the company to explore multiplayer gaming rather than churn out Half-Life sequels Do you think Half-Life 3 is on the cards for 2014? Let us know in the comments.

Katie Williams is a freelance writer and games journalist. She tweets at @desensitisation and hopes that one day, a bird will tweet back.