Nardonnet left her role as managing director of Sport last week after nearly three years with the French-owned title.
The day-to-day running of the magazine will now be undertaken by publishing director Greg Miall, who has taken over the managing director role on a permanent basis.
Nardonnet, who spearheaded Sport's UK launch in September 2006, is thought to be considering a career outside of publishing.
Her exit comes as Sport plans to increase its pagination by at least 16 pages in future editions. The magazine is upping the pagination of every issue from 48 pages to at least 64 pages, and, from 28 March, will reduce its page size from 310mm high x 265mm wide, to 300mm high x 242mm wide. The reduction follows the title's move to a new printing facility in Peterborough, which prints The Economist and Time Out titles.
Miall said: "We're always working to improve what we do, and, after the positive experience in France with a smaller size, we spent several months listening closely to feedback from both readers and advertisers."
Miall claims that the title has secured new advertising from Sony, Vodafone and Magners, which last week signed a two-page cover wrap sponsorship deal with the magazine.
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