RMC Sport, which recently launched a new six-channel line-up of TV service, has been available on the portal since the Ligue 1 Conforama and English Premier League seasons kicked off five days ago.
RMC Sport will offer SFR Presse subscribers access to exclusive content including interviews and other content, with live material being added each day.
The offer will include exclusive videos, along with pictures, analysis, live coverage and highlights of competions including Champions League, Europa League, English Premier League, English Premiership rugby, Euroleague basketball and Diamond League athletics.
Altice said that the launch was in line with the ambition for RMC Sport to become a 360° platform across radio, TV and digital.
News channel BFMTV will provide exclusive programmes for the site daily along with pictures and other content.
SFR Presse is available for €5 a month to subscribers. A new version of the portal, which has been available for two years with a catalogue of 80 press titles, was launched in July.