( CNN ) -- The worst secret in boxing is out of the bag : `` Sugar '' Shane Mosley is the most likely opponent for Manny Pacquiao 's next fight . The 39-year-old American boxer used Twitter to announce that discussions between the two camps are at an advanced stage , with confirmation expected in the next 24 hours . `` Just excited about the fight with Pac [ Manny Pacquiao ] . I know you 're going to be there , '' he tweeted to former world heavyweight champion Lennox Lewis on the social networking website . `` The ink has n't dried yet but it 's pretty much a go . '' Speculation has mounted over who would fight the Filipino eight-division world title-holder on May 7 at the MGM Grand in Las Vegas , with Juan Manuel Marquez mooted as another possible opponent . Mayweather fight will define Pacquiao 's career . But in a subsequent interview with the Los Angeles Times , Mosley confirmed that he would meet with Pacquiao 's representatives on Tuesday to finalize a deal . `` We 've already discussed the fight about three to four weeks ago , so now we 'll go over it again , '' said Mosley . `` Both sides just need to commit to what we 've talked about and then I think we 're done . '' Pacquiao 's trainer Freddie Roach had earlier ruled out Marquez while , at the same time , insisting on an important caveat if Mosley was indeed chosen . `` [ Mosley ] wo n't be an easy fight for Manny , '' Roach told assembled reporters in the Philippines , where he was celebrating Pacquiao 's 32nd birthday . `` He can punch with either hand . But if the fight pushes through , I 'll insist on a drug test . He 's been known to take steroids and it shows in his body . '' Marquez calls out Pacquiao for rematch . Roach was referring to a 2003 U.S. grand jury submission by Mosley where he admitted using EPO , a performance enhancing drug , as he prepared to fight Oscar De La Hoya . But Mosley never tested positive , and denied knowing what it was or that it was illegal . `` I 'm disappointed that this is coming out again , four years after I 've been to the grand jury and gave my truthful testimony , '' Mosley said in a 2008 statement , issued after the allegations first came to light . `` I even took a lie-detector test back then to let everyone know that I was n't trying to be an unfair fighter . '' But it looks like Mosley will now have a chance to fight arguably the best pound-for-pound boxer in the sport to prove his detractors wrong .
U.S. boxer Shane Mosley reveals that he will be Manny Pacquiao 's next opponent . Mosley tells former heavyweight champion Lennox Lewis on Twitter that he 's ` ` excited '' Mosley and Pacquiao 's going to meet in the next 24 hours to discuss it . The Filipino is booked to fight in Las Vegas in May .