The 24-year-old has won four straight Ligue 1 titles since joining Les Parisiens in 2012 and his form has regularly seen him linked with a move away.
Juventus and Chelsea have both been mentioned as potential destinations and Azzurri coach Ventura has suggested Verratti should look to join a team in a more competitive league in order to maintain his edge.
Emery has now scoffed at these comments, insisting that the quality of his side's rivals proves just how difficult the French top flight is.
He told reporters: "I don't really know the context of the interview, but I know that Ligue 1 is better now [than it used to be]. The league here is really strong. I prepare all the games and I can tell you that Lyon is one of the very good teams, for example.
"Monaco will be in the last 16 [of the Champions League], they are having a wonderful season. Ligue 1 is an important league and I think people have to see that. In Europe, French clubs are showing that the league is good."