Online bookmaker Paddy Power has odds of 1/2 that Buena, Keisha Buchanan and Siobhan Donaghy will remain apart, despite recent press rumours to the contrary, The Mirror reports.
Meanwhile, fans who expect the trio to stage a shock comeback and release new music by the end of 2010 are being offered odds of 6/4.
Last month, Buena confirmed her interest in bringing the original Sugababes back together after Keisha Buchanan became the last founding member to leave the existing group.
A report since then has suggested that Donaghy is "considering" a possible reunion with her former bandmates.
The current Sugababes lineup, comprising of Heidi Range, Amelle Berrabah and Jade Ewen, release their new album Sweet 7 next month.