Despite whispers that Barcelona's era of dominance is coming to an end, Ancelotti believes that the Catalan side will bounce back stronger than ever.
"Until Messi, Xavi, [Andres] Iniesta and Co. depart, how can you say that their time is over," Ancelotti told La Gazzetta dello Sport.
"Barcelona are not finished. Indeed, they will only come back stronger than ever.
"They say Messi is out of form because of a penalty miss, but it is naive to criticise Messi, who is the best player in the world.
"Guardiola is great, he has won everything and entertained the world with his football philosophy.
"Why should he change? It is easy to do certain things in hindsight.
"Maybe they are a bit tired. You must consider the increased strength of their opponents. Real Madrid were more continuous and more concrete this season in La Liga, and they deserved to win at Camp Nou."
Barcelona are still in the runnning for silverware with a Copa Del Rey final against Athletic Bilbao coming up.