The France international has been linked with the likes of Inter Milan, Real Madrid and Manchester United.
“Karim has said that he wants to stay another year at Lyon,” Aulas told L’Equipe.
“But I think that Kaka or Ronaldo maybe imagined remaining with their respective clubs.
“There is a tsunami called Real Madrid which provokes reactions at Chelsea, Manchester City and Manchester United.
“So it is very complicated to say that he is non-transferable. Today, it’s obvious we want to keep him.
“There is more chance he’ll be at Lyon next season than that he won’t be.
“I won’t hide from you the fact that he has been approached. For the moment, I managed to convince them not to go further.”