Mikey Graham said Gary Barlow encouraged Boyzone to get back together around the time Take That reformed.
The Dubliner (46) said he was perfectly happy to bow out of Boyzone when the group first called it quits in 2000.
Mikey admitted he "never wanted to do it again" when they decided to go their separate ways, citing the band's hectic work schedule.
"I had had enough. It's 24/7 and you're lucky if you get a day off a year. I was really happy to have some time off. I was about 27, 28 maybe," he told The Nicky Byrne Show with Jenny Greene on 2fm.
"I did a solo album and then decided, 'I'm not ready to do that workload again'.
"I got married and had my second daughter and it was all great. It was actually through Gary Barlow - my wife and his wife are best friends.
"His wife used to visit us and he was talking about putting Take That back together and he asked would I do anything with the lads."
Boyzone will be going on tour this year to celebrate their 25th anniversary and will then split for good.
"We decided after 25 years it was time to wrap it up and move on and do other things," said Mikey.
"The problem for us that we're facing at the minute, ever since we said we're breaking up, the arenas are selling out. Everything is going fantastically well."
The group still think of bandmate Stephen Gately, who died in 2009, during every performance.
"A section of the show is dedicated to him," said Mikey.