Manny Pacquiao has not sparred and will never spar with Super Bantamweight king Guillermo Rigondeaux throughout the course of his training in preparation for his mega-fight showdown with Floyd Mayweather Jr. on May 2, according Hall of Fame trainer Freddie Roach.

ESPN boxing's lead writer Dan Rafael stated in his blog entry that he was told by Pacquiao's trainer himself about not considering Rigondeaux training partner for his top prize fighter, primarily because the Cuban defensive expert is 20 pounds lighter than Mayweather and he's fighting in a southpaw stance.

"One of the big Floyd Mayweather Jr.-Manny Pacquiao fight rumors to spread like crazy on social media in recent days, based on unsubstantiated reports, was that Pacquiao would be sparring with junior featherweight champion Guillermo Rigondeaux to get ready for the fight. It is not true, according to trainer Freddie Roach, who picks the sparring partners," per Dan Rafael ESPN boxing blog.

"Rigondeaux as a sparring partner for Pacquiao makes no sense, anyway, because although he is great defensively and fast like Mayweather, he is also about 20 pounds lighter than Pacquiao and left-handed," he added.

According to Rafael, Pacquiao is scheduled to kick off his sparring session on Tuesday against two talented young fighters whom Roach believes are capable of mimicking Mayweather's shoulder roll defense.

Kenneth Simms Jr. (5-0, 2 KOs) and Rashidi Ellis (14-0, 11 KOs) are both excellent up-and-coming prospects who Roach invited to visit his Wildcard Gym and spar with the eight-division world champ.

"I'm really happy where Manny is right now," Roach said via ABS-CBN. "We're going to start sparring this week, and I'm a little bit anxious to get that going."

Meanwhile, Pacquiao confirmed on Monday that he has already undergone the first round of drug testing.  According to ABS-CBN news, the Pacman has already sent blood and urine samples for analysis. If found positive of taking performance enhancing drugs or blood doping, Pacquiao will be banned from the sport for at least four years.

Olympic-style blood testing was the sticking point of the previous negotiation between Mayweather Jr. and Pacquiao five years ago. The issue dragged both camps to the halls of court after Pacquiao filed a libel case against Mayweather and his confidantes for accusing him of doping.

Pacquiao, who claimed to have fear of being injected, eventually surrendered himself to Olympic-style drug testing by the VADA (Voluntary Anti-Doping Association) and then made a concession to undergo USADA (U.S. Anti Doping Agency) drug testing in order for the fight with Mayweather to finally happen.