Tim Tszyu has a plan to salvage his scheduled fight date and plans for his U.S. debut.

The unbeaten, second-generation boxer has volunteered his services to next face lineal/WBA/WBC/IBF junior middleweight champion Jermell Charlo, who is momentarily left without an opponent. Charlo was due to next face WBO titlist Brian Castano (17-0-2, 12KOs), who was forced to withdraw from their March 19 undisputed championship clash at Crypto.com Arena in Los Angeles after suffering a slight biceps tear during training camp.

Event handlers have yet to determine whether the show as a whole will be postponed, though it is likely the case. Australia’s Tszyu (20-0, 15KOs) was due to face 2012 U.S. Olympian and veteran trialhorse in the evening’s co-feature. The fight will represent his first in the states while introducing him to a new audience as he is promised the winner as the current WBO mandatory challenger. His team has taken steps to get the WBO to enforce that status, though Tszyu has since offered an alternate solution that could satisfy all involved parties.

“So you’ve all heard the news that Brian Castano has withdrawn from the rematch with Charlo with a bicep injury,” Glen Jennings, Tszyu’s manager stated Thursday evening. “The big question that everyone is asking is where does that leave our planned co main event card for Tim.

“We have said all along we won’t sit and wait, we will stay busy, the titles will come in due course and so we will work our way through this and keep you all posted. We have put it out there if Castano is out, we will happily step in and take Charlo. Stranger things have happened. Tim and our team are ready to go regardless of who stands in front of him in the ring in March.”

Argentina’s Castano and his team estimate that the injury—which was first discovered during the first week of February—is expected to heal in time to reschedule the fight for the first available date in April. A working fight date of April 23 has been discussed—primarily due to it being the only realistic option without pushing the fight back to May.

Any option other than Charlo and Castano next facing each other could trigger a series of mandatory title defenses ordered by all involved sanctioning bodies.

Tszyu has been the challenger in waiting for Castano’s title since last August, with the WBO stalling on plans to order the fight while waiting out the status of Charlo-Castano II. The WBO accepted the plans by Premier Boxing Champions (PBC) and TGB Promotions to proceed with a March 19 date for the rematch to their July 17 split decision draw, though no longer as eager to wait too far beyond that point.

Castano was forced to respond to a ‘Show Cause’ letter from the WBO asking for a valid reason why the mandatory title fight should not next be ordered.

Tszyu agreeing to next face Charlo (34-1-1, 18KOs) on March 19 and the winner to next face Castano makes for a great headline, though several other factors are in play. Charlo’s IBF title is overdue for a mandatory title defense, while the WBA has named Israil Madrimov (8-0, 6KOs) as its challenger in waiting.

For now, all that can be done is to await further instructions. Tszyu—whose father Kostya Tszyu is a Hall of Fame former undisputed junior welterweight champion—wanted to make clear that he is willing to do his part to ensure that nobody has to waste or stall their current training camp.

“We don’t have all the info to be able to make an informed decision, but together with [our] promotors we are working through the options and doing whatever is necessary whist waiting for the outcome,” noted Jennings. “Boxing is a tricky business at best, so these things happen, injuries occur beyond our control and so you have to remain flexible and positive and work hard to ensure the best outcome for your fighter, team and fans.”

Tszyu last appeared in the ring November 17, earning a twelve-round, unanimous decision win over former title challenger Takeshi Inoue in Sydney.

Castano won the WBO junior middleweight title in a twelve-round, unanimous decision win over Patrick Teixeira last February 13.  His lone title defense came in the aforementioned split draw with Charlo, who has made two defenses of his second title reign.

Charlo regained the WBC title in an eleventh-round knockout of Tony Harrison in December 2019, avenging his lone career defeat from exactly 52 weeks prior. Charlo then unified the WBC/WBA/IBF titles in an eighth-round knockout of Jeison Rosario in September 2020, also re-establishing the division’s lineal championship with the win, followed by his draw with Castano last summer.

Jake Donovan is a senior writer for BoxingScene.com. Twitter: @JakeNDaBox