Nadine Coyle says launching a Girls Aloud reunion would be like “moving a mountain”.
The girl band, who found fame in 2002 on TV talent show Popstars: The Rivals, went on hiatus on 2009 before splitting in 2013.
Coyle, 34, told Hello! magazine: “People are always asking if we’ll do something for our 20-year anniversary.
“It would be nice, but it takes so much, it’s like moving a mountain. So many people are involved.”
She said reviving the band with Cheryl, Sarah Harding, Nicola Roberts and Kimberley Walsh “would take a lot of planning and organising”.
The singer said her confidence drained away during her time in the chart-topping five-piece.
“I was losing sight of myself and started to get anxiety and stress,” she said. “You work at such a pace and you don’t have time to sit with yourself.”
Coyle had daughter Anaiya with former American football star Jason Bell in 2014 and they later split after a 11-year relationship.
“There are no issues, no stress,” the ex-I’m A Celebrity… Get Me Out Of Here! star told Hello!
“We’re not together as a couple, but I see him every day. We get on great. We were always best friends.”
The full interview is in Hello! magazine, out now.