By Lou Aguila (staff@latinospost.com) | First Posted: Aug 04, 2013 03:57 PM EDT

Floyd Mayweather Sr. was in trash-talking mode again this weekend, but instead of unleashing verbal attacks towards his son's main rival Manny Pacquiao, the father and current head trainer of pound-for-pound champion Floyd Mayweather Jr. fired shots at former world champion Amir Khan.

Mayweather, who's currently training his son for the upcoming mega-clash with Saul Canelo Alvarez on September 14, said he really wanted Floyd Jr. to destroy Khan inside the ring more than any other elite fighters.

"If there's one fighter that I want Floyd to whip his [expletive], that's Amir Khan...he ain't got nothing to be brash about. He's no outstanding fighter...as long as he stays here, he's going to keep getting his [expletive] whipped," Mayweather told Husleboss.com.

However, the elder Mayweather didn't think the fight between his son and the Briton will ever happen at all because Khan is going to lose badly anyway in his next fight against IBF welterweight champion Devon Alexander.  

"To be honest, I don't think he [Khan] will win it [Devon Alexander fight]...I think Devon Alexander is going to shut him down," said Mayweather, who was apparently irritated by Khan's claim of having the physical tools and boxing skills to end Floyd Jr's unbeaten run.

Khan, who's coming off wins against Carlos Molina (10th round TKO) and Julio Diaz (12th round unanimous decision), is reportedly being penciled to fight Alexander in Dubai on December 7.

The Briton considers his looming showdown with Alexander as a great opportunity to revitalize his boxing career following his losses against Danny Garcia and Lamont Peterson, and eventually make his case as a legitimate contender for the reigning pound-for-pound champion.

"It's all about moving to that big fight against Mayweather," Khan told Web Orange.co.uk. "Hopefully getting this win against Alexander will get me into that fight.