Tim Tszyu's return to the ring has been put on ice with his world-title fight against American Vergil Ortiz Jr cancelled on medical advice.

Tszyu was set to return to the United States to fight on a blockbuster card in Los Angeles on August 3 (local time), headlined by pound-for-pound king Terence Crawford.

The clash with undefeated knockout specialist Ortiz was for the WBA super welterweight interim world title, with Tszyu taking preparations off-shore and training with his legendary father Kostya in Thailand this month.

But Tszyu has been advised to stay out of the ring to give his head wound more time to heal, after suffering the injury against American Sebastian Fundora in late March.

The Australian relinquished his WBO super-welterweight belt to Fundora in a controversial split-decision defeat in Las Vegas.

Tszyu walked into the Towering Inferno's elbow late in round two and suffered a gruesome head gash.

He battled on without full vision for 10 rounds and was even awarded a 116-112 victory by one of the judges.

Fundora is also out of the ring until at least September after having facial surgery after the fight.