WBO world welterweight champion Manny Pacquiao and Amir Khan say they have agreed to terms for a fight April 23.
The boxers' promoters have yet to announce any details.
Pacquiao, who came out of retirement to win the WBO belt by beating Jesse Vargas in November, said on his Twitter account he is fighting Khan because "this is what the fans wanted."
Khan hasn't fought since stepping up to middleweight and getting knocked out by WBC champion Canelo Alvarez last May. He described the bout against Pacquiao as a "super fight."
Khan and Pacquiao used to be sparring partners under trainer Freddie Roach. Khan left Roach in 2012.