WBO mandatory challenger Tim Tszyu is hoping to get a date finalized for his crack at undisputed champion Jermell Charlo.

Tszyu traveled to the United States back in May to watch Charlo score a knockout of Brian Castano to become the undisputed champion.

The Aussie star made his American debut in March when he got off the floor to pick up a dominant decision win over Terrell Gausha. Since that bout, Tszyu underwent surgery on both his hands.

Charlo has lashed out in several interviews - promising to batter and stop Tszyu.

"I've sort of accepted this guy's just an angry man. He's like an old man who is just grumpy and angry all the time," Tszyu told Fox Sports.

"That's his personality. He's going off at ESPN for not putting him in the pound for pound rankings. He's going off at reporters. He's just an angry man. Being emotional like that, it's not good to have in boxing. So if you can get under his skin, he's going to be rattled."

Tszyu is ready and willing to travel if necessary to fight Charlo.

"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," Tszyu said back in June.

"I'd like to fight him in Las Vegas, that's where the biggest boxing events have always been."

Charlo's handlers are still working out the details with Bakhram Murtazaliev - the IBF's mandatory challenger. Murtazaliev (20-0, 15KO) has been the IBF's mandatory challenger for the past two years but he's been paid to step aside several times. Many observers expect him to once again step aside in order to allow the Charlo-Tszyu clash to take place.