The singer told BBC Newsbeat that all four current members of the band were in contact with Williams again, and they had been “getting to know him again”.
“As long as we’re alive people are going to ask if we’re going to get back together,” he said. “I do believe we will one day, I just don’t know when.
“The five of us were together a lot over the summer and it just felt like we were back in the ’90s. I get an email every week from Rob, Mark [Owen] gets one every other week, J [Jason Orange] phones him once a week.
“We’re all keeping in touch. It’s really fun getting to know him again, I must say. The five of us are rebuilding our friendship, and that’s really the only place to start.”
Take That released their new album, ‘The Circus’ on Monday (December 1), and notched up around 133,000 copies sold after one day on sale in the UK, the best first day sales of 2008.