The midfielder suffered a problem while "keeping fit" in Miami but Aston Villa manager Paul Lambert has backed his player to return to full fitness
The 27-year-old was injured “keeping fit” while in Miami and subsequently went under the knife to rectify the problem.
Villa manager Paul Lambert has described the injury as disappointing but says the club will help the Frenchman return to fitness.
"The priority is to ensure that Charles receives the very best care and he has done and will continue to do so throughout his recovery period," Lambert told the club’s official website.
"It's a blow for Charles, obviously, but he'll get his head down and get himself fit again and he'll have plenty of support in doing so."
The club have also revealed the club’s head of sport and exercise medicine, Roddy MacDonald, has flown out to the States to see the midfielder and will accompany him back home.
However, Villa have yet to reveal how long they expect to be without the services of the midfielder.
The Villans kick off their Premier League campaign away to Arsenal on 17 August.