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Take That have hinted Robbie could stay with the band after this summer's tour.
Initially the singer was only ever scheduled to complete one album with the group and go on one tour - after an absence of 15 years.
But in an interview in the States, Gary Barlow says the reunion has been much smoother than any of them expected.
The Sun reports Gary said, "We really want that and this is our dream come true. At the beginning we all said it was going to last for one album, but we're starting to write again, so we don't know now."
Mark Owen added, "At the beginning there was a fragility to the whole thing, but that has gone now."