Tyson Fury has cast further doubt on his planned heavyweight clash with Anthony Joshua, saying he believes there is only a one per cent chance of the fight taking place.

The long-awaited all-British showdown was officially announced on Thursday for December 11 at Cardiff’s Principality Stadium after months of negotiations over the venue and other arrangements.

However, Fury questioned the agreement on Saturday, claiming that Joshua and his promoter, Eddie Hearn, were attempting to withdraw from the fight.

Asked on his Furocity YouTube channel to estimate the likelihood of the bout going ahead, Fury replied: “One per cent.”

Fury questioned how the contest could proceed if, in his view, one of the fighters did not want to participate, while also pointing to the lengthy difficulties that have prevented the two former world champions from meeting in the ring.

He also questioned why the fight had repeatedly failed to materialise despite his previous willingness to face Joshua.

The proposed bout is being staged by Saudi boxing powerbroker Turki Alalshikh’s The Ring and UFC president Dana White. However, Joshua’s promoter Hearn has publicly disputed White’s involvement in the event.

White, speaking after Johnny Fisher’s victory on Saturday, confirmed his involvement but also expressed uncertainty over whether the fight would ultimately take place.

He said more would become clear within the next few days and criticised Hearn’s role in the negotiations.

Fury also said he had initially agreed to fight Joshua at Croke Park in Dublin before the venue was changed to Cardiff.

Despite the latest uncertainty, the organisers have confirmed December 11 as the date for the contest, which is expected to be one of the biggest all-British heavyweight fights in recent years.

Fury and Joshua have both previously held world heavyweight titles and have been linked with a meeting for more than a decade, but repeated negotiations have failed to produce a fight until the latest agreement.