Villa boss Lambert won't rush N'Zogbia rehab
Roddy MacDonald, the club's head of sport and exercise medicine, has travelled to the US to be with N'Zogbia and will accompany him back to the UK. The severity of the injury is unknown and the Frenchman will return to Birmingham next week to continue his rehabilitation.
"The priority is to ensure Charles receives the very best care and he has done and will continue to do so throughout his recovery period," said Villa manager Paul Lambert.
"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."