Manny Pacquiao will return to the ring on 5 November against WBO welterweight champion Jessie Vargas.
It was a surprise as Pacquiao had announced his retirement after beating Timothy Bradley in April.
“Retirement doesn’t suit Manny right now,” Pacquiao’s manager Michael Koncz told the Los Angeles Times.
“Boxing is in his blood. When he trains, it’s like a pressure-release valve. You can see a dramatic difference in his mood... he’s happy.
“It’s amazing what training and fighting does for him.”