Philippine boxing legend Manny Pacquiao announced in New York Monday that he was "80 to 90 percent healed" from a shoulder operation and expected to return to training within weeks. Pacquiao had surgery on May 7 to repair a tear to his right rotator cuff sustained in a unanimous points defeat against American Floyd Mayweather in Las Vegas just a few days earlier. Pacquiao announced last week he would likely retire next year after one last fight to focus on his career in politics, and is in talks with Mayweather and Britain's Amir Khan on who will be his last opponent. "My shoulder is 80 to 90 percent healed and I believe I can start training in November or December. I can fight early next year. I can fight by March," he told the Asia Society in New York, whose Asia Game Changer award he is to receive at the United Nations Tuesday. Pacquiao injured his shoulder three weeks before the fight with Mayweather. He later said he aggravated it in the fourth round, when he landed some of his best punches of the night against Mayweather. "He kept moving around and didn't want to fight toe to toe with me, exchanging punches," Pacquiao said Monday. Asked if he could change that in a rematch, Pacquiao said, "I think so, especially (after) I fixed my shoulder. "If you ask me, of course, I want a rematch," Pacquiao added. "I heard that he retired already. If he really retired, then there's no rematch. But if not ..." Pacquiao, a congressman since 2010, announced this week his bid for a senate seat in national elections to be held in May next year. Asked about the possibility of one day running for president, the 36-year-old boxer said, "Right now, I don't have that in my mind." Under Philippine law, presidential candidates must be at least 40. "Becoming a president is not the plan of the man. It's the plan of God. Who knows if he will become a president?" said the boxer, a born-again Christian. Pacquiao turned professional when he was 16 years old and has won an unprecedented eight world titles in as many weight divisions.