Fuming Josh Taylor branded Jack Catterall "a clown" as the champions went on the offensive over injury digs.
The undisputed light-welterweight champion became only the fifth boxer ever to simultaneously hold all four belts after defeating Jose Ramirez in Las Vegas last year.
He had been set for a homecoming fight against Catterall on December 2021 at the Hydro, but the fight was pushed due to a training knock.