Undefeated junior middleweight star Tim Tszyu has no problem with facing WBO, WBC, IBF, WBA junior middleweight champion Jermell Charlo in the United States.

Last month in Los Angeles, Tszyu was ringside to watch Charlo score a knockout of Brian Castano become the undisputed world champion at 154-pounds.

To finalize the details quicker, Tszyu is prepared to travel.

"Of course it’s a big ask, fighting the top bloke in the division in his backyard, but once you’re in the ring it’s one-on-one, it doesn’t matter what friends or family are there or where it’s at, it doesn’t bother me," Tszyu told News Corp.

However, there is currently a big issue with a potential mandatory defense owed by Charlo.

The WBO ordered Charlo to make a mandatory defense against Tszyu.

But, Bakhram Murtazaliev (20-0, 15 KOs) - through his legal team - is enforcing his mandatory title shot under the IBF. The Russian fighter has been in line for a mandatory crack at Charlo for two years.

"There exists a contract for Jermell Charlo to fight against Bakhram Murtazaliev and it appears that the WBO is interfering with that contract and with the prospective economic advantage of Bakhram Murtazaliev," Murtazaliev's lawyer, Pat English, wrote in a letter addressed to the WBO and all parties.

"Charlo agreed that he had ten days to either relinquish the title or he would proceed to fight Bakhram, who is the IBF mandatory. Charlo did not relinquish the IBF title and plans have been proceeding for that match." 

In an effort to throw water on the fire, Tszyu is willing to face Murtazaliev in his first defense - should the Australian star defeat Charlo.

"We’re ready, and there’s genuine interest behind [a fight between me and Charlo]. Murtazaliev, people have got no idea about him, Charlo needs interesting bouts and this one makes sense," Tszyu said.

"If it’s meant to be it will be, my training hasn’t stopped. I would have loved to have the fight at the new Sydney Football Stadium, but if it means I’ve got to go to America to get this fight I’ll go there, no problems.

"I’d like to fight him in Las Vegas, that’s where the biggest boxing events have always been. Murtazaliev has been waiting in line a long time, he deserves a shot as well, so 100 percent I will give him first crack if I beat Charlo."