Both centre-right heavyweights, keen to put behind the in-fighting and scandals that have stopped the opposition UMP party from mounting a credible fight against the unpopular Socialist government, are set to go head-to-head over the next few years with their sights firmly set on the 2017 general election.
Francois Fillon, who was prime minister during Sarkozy's five-year term, is also wading into the battle as he also vies for a chance to be the main opposition presidential candidate in 2017.
"Some are trying to make people believe that I will not go through with this. Well I'm going to prove it. You will see in 2016 and 2017."
Sarkozy, who inspires disdain and adoration in equal measure, will be standing for the UMP presidency in November and is due to go live on television today evening to explain his plans for France after more than two years outside politics.
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"It's not about saviours for me, it's about ideas," Fillon told supporters today, in a thinly-veiled allusion to Sarkozy, whose comeback is perceived by some as the only way to re-unite a party that has fallen far from its glory days.
The former president himself, in an interview with the JDD weekly today, lashed out at his two main rivals, pointing to Juppe's age and past conviction for graft and to Fillon's inability to take leadership of the UMP during his absence.
"That's 20 million people.