The full-back fell heavily in the 68th minute of The Gunners’ 2-1 defeat at White Hart Lane and had to be stretchered from the pitch.
With Sagna due to represent France in the upcoming international fixtures against Albania and Bosnia, the French Football Federation have confirmed the seriousness of the injury.
“The doctor of the France team, Fabrice Bryand, was informed by his Arsenal equivalent of a fracture to the right fibula of Bacary Sagna,” the statement reads.
“The player was hurt during his club’s 2-1 loss against Tottenham on Sunday. The defender will be operated on and is not expected to be available for three months.”
The news will be another blow to Arsene Wenger’s already struggling side, who are currently without Thomas Vermaelen, Jack Wilshere, Johan Djourou and Abou Diaby due to injury.
Youngster Carl Jenkinson replaced Sagna at the weekend, and now looks set to fill in at right back until the more senior man returns.
By Gareth McKnight