Floyd Mayweather Sr. isn't over with Manny Pacquiao yet--alleging yet again that the boxer used performance enhancing drugs in his fights.

Just after his son won in 12-round match against Marcos Maidana on Saturday at MGM Grand in Las Vegas, Mayweather Sr. relaunched an age-old assault on Pacquiao, alleging that he used performance enhancing drugs at one point in his career.

"What Pacquiao did over these years is fake people out, had people thinking that he was knocking somebody out," Mayweather Sr. told Boxingscene.com. "He wasn't knocking no damn body out. All he did, like I said, he used drugs." 

According to GMA News, Pacquiao filed a lawsuit in 2009 against the father and son and their relative Roger, but dropped the defamation charge three years later after an out-of-court settlement.

Mayweather Sr. revisited his old tactic as he assured the public that his son's camp won't face Pacquiao yet, saying,  "I don't think that Manny Pacquiao will be next," per M Live.

He began the steroid allegation in 2009, it added, explaining that the Filipino superstar never tested positive for any performance-enhancers.

"What would you say about that? A guy that was putting people to sleep, now, all of a sudden, he ain't knocking nobody out, what would you say? Would you think something's wrong with that?" he said, as quoted by M Live. 

Bob Arum and CBS president Les Moonves have been in talks on the Mayweather-Pacquiao possibilities, the report said, adding that Stephen Espinoza, Showtime Sports' executive vice president, mentioned that Arum and Moonves "often meet."

"If it happens, it happens... I just fought a good, solid, strong competitor tonight, and you guys can keep asking the same questions over and over again and you'll get the same answers. That's not my focus," Money said on the fight against the Argentine, as quoted by M Live.

Espinoza has expressed that Pacquiao was his first choice against Mayweather Jr., with two fights remaining in a six-fight deal. However, he told Los Angeles Times, the initiative should begin with Pacquiao, who failed to come to terms with Mayweather since talks began in 2009.

"In terms of the actual substance of discussions, it hasn't progressed to anything that's worth commenting on," Espinoza said, as quoted by LA Times. "But if you're saying, at this stage of their careers—with the finish line in sight—is there maybe more psychological pressure or interest to get that one fight out of the way that's always eluded you? Absolutely."

Amir Khan, who could be the next target of the undefeated boxer, watched the press conference after the unanimous-decision win, M Live said. 

"I saw a fighter who was aging in there tonight," Khan told the report. "I don't just want to fight him for the financial prize. I want to fight him because I know I can beat him."