Mercedes Formula 1 boss Toto Wolff believes the Spa circuit's layout could lead to a "totally different conversation" compared to the form shown by leading teams last weekend.
Ferrari goes into the summer break without a win this season but Wolff thinks the characteristics of the Belgian and Italian Grands Prix that follow the shutdown could lead to a completely different picture.
"It's a track that probably doesn't suit them very well," Wolff said of Ferrari in Hungary last weekend.
"They have a very strong engine and less drag, and that's why we will see a very strong Ferrari in Spa and in Monza.
"I have no doubt that the conversation could be totally different than the one we're having right now."
Wolff believes the layout and the power-sensitive nature of these tracks will suit Ferrari "a lot" and has made it clear Mercedes cannot rest entirely over the break.
"It's going to be difficult for us and that's why it's about enjoying the moment and starting [this week] we have to sort out our problems in order to be competitive at Spa," he added.
After the race in Hungary, Ferrari team principal Mattia Binotto said his outfit's one-minute deficit was a legacy of its downforce deficiency being exaggerated in the race.