The band started as a raunchy burlesque dance troupe before finding chart success in 2004, but a number of line-up changes and the eventual departure of most of the original members left the group in limbo in 2010.
They appeared to finally split after Scherzinger left to pursue a solo career.
The Pussycat Dolls' success was marred by rumours of in-fighting and jealously, and Scherzinger recently sparked a furore by claiming she "did 95 per cent" of the singing.
Bachar, who walked out in 2008, now insists the original members of the band are still friends and may consider re-forming, but she is adamant there won't be a place in the line-up for Scherzinger.
She tells British newspaper The Sun, "I'm still good friends with Ashley (Roberts) she's my soul sister. All of the Dolls are still friends, apart from Nicole. Nicole knows I had a child, my daughter Kaela Rose last year, but she never got in touch.
"A Pussycat Dolls reunion isn't out of the question. Five of us - and not Nicole - could happen. But all six? Never. Too much water under the bridge."
Bachar goes on to suggest Scherzinger caused the split by isolating herself from the rest of the band, even travelling in her own tour bus.
She adds, "I think Nicole got it into her head that she was the real star and would be better off on her own. She started travelling in her own tour bus and the divide between her and the rest us just got bigger... Nicole basically wanted to be front and centre all the time. We were expected to work our a***s off to boost Nicole and her own career. The situation became unbearable."