"We don't want to sound too pessimistic because it's too early to tell. What Momo needs right now is our support and the best care he can get," said chief executive Rick Parry.
"His right eye is closed down and it's been difficult to assess the damage because of the swelling and bleeding.
"However, it's too early to jump to conclusions. Obviously this is a very traumatic time for Momo and the club is in constant contact with his family and representatives. It's a very nasty injury.
"He's now in London being treated by the best specialists in the country."