Robbie rejoined the man-band last year – 15 years after he walked out. Originally they said the reunion would be just for one album and one tour, but now it looks like they could be in it for the long haul.
Bandmate Gary Barlow, 40, told The Sun, '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.'
Robbie is believed to have started looking around for a solo record deal, sparking speculation that he could be about to part ways with Take That. But according to the report, he is hoping to release solo material alongside his work with the group.
Mark Owen, 39, added, 'We are a team. At the moment Take That is five people, but it feels more than that. There's a lot of people who have a relationship with us.
'At the beginning there was a fragility to the whole thing, but that has gone now.'
And Rob agreed. 'We are a cohesive unit. Hopefully there'll be another album with the five of us, but we don't know if it'll be the next one,' he said.