The British rock group's legendary singer has for a long time been adamant he would not reform the 'Black Dog' group, although he has now admitted he could be open for discussions with surviving ex-bandmates Jimmy Page and John Paul Jones.
When asked by avclub.com if Led Zeppelin were thinking of playing again, Robert replied: "I think we're probably thinking about talking."
Robert reunited with the group for a one off show in 2007 in tribute to Atlantic Records founder Ahmet Ertegun, but said he was left questioning himself about it.
He explained: "I was driven to distraction with fear and reminiscences and huge reflections of my mortality and, like, can I do it? Is it best I leave it as it was? Is it some kind of pulsing fun machine? But we had to do it. We had to say goodbye to Ahmet and that was a great way of putting a lot of things back in the box that were all over the floor."
Jimmy has previously expressed his desire for the group to play together again, but said their future lies in Robert's hands.
He said: "You'd better ask Robert Plant what the future of Led Zeppelin is. Musicians can always play together but I don't think you can go out with a band called Led Zeppelin if you haven't got the original vocalist."
Robert's latest album, 'Band Of Joy' is available now.