City said on their website (www.mancity.com) that the player had travelled to Barcelona to see a specialist, after initial tests in Manchester, with the results on Thursday confirming the extent of the injury.
However, the 23-year-old Frenchman suffered a nasty-looking knee injury during City's 5-0 win over Crystal Palace on the weekend and fans feared the worst as Mendy was immediately subbed off and soon seen trudging around in crutches.
Pitbull sends in private jet to ferry cancer patients from Puerto Rico
Barea and owner Mark Cuban to the list of heroes who have come to the rescue of victims of recent horrific hurricanes. MacMahon noted that Brea is the only active National Basketball Association player who's a Puerto Rico native.
Gundogan said after the Champions League victory over Shakhtar that he will offer his support to Mendy and that he knows what he is going through: "He is the most disappointed guy".
The Germany midfielder spent nine months out and Mendy is facing a similar time frame, which also leaves the France global sweating on missing out on next year's World Cup Finals in Russian Federation.
But the news of Mendy's injury will come as a major disappointment to those concerned with the club and they have wished him a speedy recovery.
City released left back Gael Clichy in the summer while Aleksandar Kolarov asked to leave to join Roma.