Taking to micro-blogging site Twitter, the guys said: 'Unfortunately Abz is unable to make The Big Reunion Tour. But don't worry he's not leaving the band!
'Abz is still confirmed for all other 5ive shows coming up! We had to make a decision whether to go forward for the tour as a Three - we didn't want to let the fans down.'
Now, the remaining members will undertake the live dates without him.
He'll be back: Richard 'Abs' Breen leaving the BBC Radio 1 studios in London
Four bad boys: From left, Abz Love, Ritchie Neville, Scott Robinson and Sean Conlon will carry on without J
The news will be welcome relief for fans, who have seen the group disband once before - with the blame being laid with J - Jason Brown - who declined to even be filmed and interviewed for the show.
After first agreeing to take part in The Big Reunion he pulled out just a few weeks before filming began.
Five - Sean Conlon, Scott Robinson, Richard 'Abs' Breen, Ritchie Neville, Jason 'J' Brown at the Brit Awards at Earls Court, London in 2000
Speaking about their breakdown at the peak of their fame, the other band members recall that J was a very intimidating and controlling person. The biggest problem in the group was between Sean and J, with the former having to quit the band following a nervous breakdown.
Sean recalled: ' [J's] words to me were that he hated me from the very first moment he heard me sing. I was very very confident in the beginning of the band. But I became the insecure one, I let the environment destroy me.'