"Newcastle are already there," added Guardiola, whose City side are seeking a third consecutive Premier League title.
"I saw them against Tottenham. The central defenders went man to man against Kane and Son with no problem at all.
"We played them in the third game of the season. Imagine this team playing one game a week? We know how good Eddie the manager is.
"They have new players. They play brave. They are a contender to be there."