Venezuela's President Hugo Chavez said his friend and political ally Fidel Castro is "in charge" again nearly nine months after undergoing intestinal surgery. The Cuban leader has not been seen in public since before July 31, when he announced he had undergone surgery and provisionally ceded power to his younger brother Raul. With Cuban officials giving increasing positive reports about Fidel Castro's health, there has been speculation recently that he could soon be back in the public eye. "Fidel is in charge. Fidel is in charge," Chavez said Sunday, revealing that he received a "philosophical letter" from Castro the day before and that it ran to nearly 10 pages. Speaking during a meeting of leftist leaders, Chavez laughed as he said that Bolivian President Evo Morales "is determined that Fidel will come out on May 1." "I think that Evo and Fidel have such a secret plan that even I don't know what it is. I don't dare to make comments," Chavez said. Since his surgery, Chavez has regularly offered updates on Castro's health, while the 80-year-old leader has appeared periodically in photographs and videos released by the Cuban government. Castro's condition and exact ailment remain state secrets, but he is believed to suffer from diverticular disease, which can cause inflammation and bleeding in the colon. Chavez said Castro's health troubles have clearly forced him to slow down but that he has made a "real improvement" and is in an "extraordinary mental state." Chavez was speaking during a summit of the Bolivarian Alternative for the Americas, or ALBA, a bloc that involves left-leaning allies Cuba, Venezuela, Nicaragua and Bolivia, and promotes socialist trade initiatives and cooperation to counter U.S.-backed free trade plans. Castro's government was represented at the summit by Vice President and Cabinet Secretary Carlos Lage. "For eight months he has been fighting for his own life," Lage said of Castro. "Today we can tell you that Fidel has won the fight for his life ... and now he is consolidating the victory, and for that reason he hasn't been present here as all of us would have wanted." Lage and Chavez both said Castro has continued to play an active role behind-the-scenes. "He is in charge. Fidel is the great helmsman of the ALBA," Chavez said. Chavez held Castro's letter for the television camera, showing a firm signature that he called a clear sign of the Cuban leader's improving heath. "Fidel does impossible things," Chavez said.