Tony Harrison has offered to assist Tim Tszyu in “any way” when the unbeaten Australian prepares for his shot at their division’s undisputed champion.

Harrison knows Jermell Charlo as well as any boxer because Harrison has fought Charlo twice. As the only opponent who has beaten Charlo, Tszyu and his team value Harrison’s insight and expect to reach out to him before Tszyu challenges Charlo later this year for his IBF, WBA, WBC and WBO 154-pound championships.

Tszyu also appreciates how Harrison handled himself in Tszyu’s home country, where Harrison lost by ninth-round technical knockout in their fight for the WBO interim junior middleweight championship. After dropping and stopping Harrison on Sunday afternoon at Qudos Bank Arena in Sydney, Tszyu’s hometown, Tszyu explained that he expects a much different experience during the buildup toward his fight against Charlo.

“Charlo’s a real angry man,” Tszyu said. “That’s just how he is. He barks a lot. Tony, on the other hand, is a happy man, happy [about] what he does, enjoys life a bit more. The other guy’s just grumpy all the time.”

Detroit’s Harrison playfully talked trash during the promotion of their bout. He repeatedly stated that Tszyu hadn’t done anything to warrant the Charlo bout, but Tszyu never took Harrison’s criticism personally.

“There was never no bad blood between us, man, ever,” Tszyu said. “Like I said, I could show him around Australia one day and he can show me around Detroit one day.”

Harrison (29-4-1, 21 KOs), who has admitted mutual dislike between him and Charlo, expressed respect for Tszyu as well.

“I have no ill feelings toward Tim,” said Harrison, whom Charlo knocked out in the 11th round of their rematch in December 2019. “I enjoyed it. I enjoyed fight week. I enjoyed the presser. Tim, he a good dude. Like I said in the beginning, it’s no hard feelings between me and him, so any way I can be of service to anybody that’s gonna help me and my situation out [I’ll do it]. You know what I mean? Like whatever pays the bills for that role is all I care about.”

Houston’s Charlo (35-1-1, 19 KOs) indicated during Showtime’s coverage of the Tszyu-Harrison fight Saturday night that he’ll be ready to return to the ring by the end of this summer. The 32-year-old Charlo was scheduled to defend his four titles versus Tszyu (22-0, 16 KOs) on January 28 in Las Vegas, but their “Showtime Championship Boxing” main event was postponed because Charlo suffered two fractures in his left hand while sparring a few days before Christmas.

Charlo confirmed that he’ll fight Tszyu next. Tszyu won the WBO interim junior middleweight title by beating Harrison and is the WBO’s mandatory challenger for one of the four championships Charlo holds.

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.