Blanchard told insidethegames here at the Commonwealth Youth Games that the CGE were not concerned by the city's plans, which originally involved installing and removing the track in less than three-and-a-half months.

insidethegames understands Liverpool 2022 will unveil updated proposals surrounding athletics next month.

They are likely to differ from the current planned timescale.

The CGE revealed yesterday that they plan to announced whether Birmingham or Liverpool would be put forward as their chosen city to host the 2022 Commonwealth Games, stripped from Durban in March after the South African city failed to meet a series of financial deadlines, in September.

Blanchard admitted Liverpool 2022's athletics plans were a key challenge for the Bid Committee to overcome.

"That is one of the issues that they have to reassure us on that there is a sufficient time window to do that and that is one of the challenges they have got," Blanchard told insidethegames.

"It is an obvious question and one that still needs answering properly.

"They have provided assurances and we have no reason to disbelieve them but what we want to do to make sure we are absolutely bulletproof here is to get guarantees and assurances that are written and with documents and everything else.

"That takes time and they’ve got time.

"We are not concerned about that but they have to show they are capable of doing that and there is sufficient time to do it."

It is claimed the accommodation of the temporary 400 metres athletics track will be achieved without any disruption to the "intimacy, fan proximity and atmosphere" of the stadium.

It was initially suggested that the track would be installed after the final home game of the 2021-2022 Premier League season and removed before the first scheduled match of the 2022-2023 campaign.

When Glasgow 2014 transformed Scotland's national football stadium Hampden Park into an athletics venue, it was closed in November 2013 and the track was not ready until the following May. 

It then took until December 2014, four months after the completion of the Games, to remove track and restore the stadium to its previous condition.

In a statement sent to insidethegames, Liverpool 2022 hinted they would reveal updated their plans for athletics next month.

They are currently working with renowned US architect Dan Meis, who is designing the proposed 50,000-capacity stadium.

"We have had very positive discussions with the Commonwealth Games Delivery Unit (CGDU) and Commonwealth Games Federation (CGF) on a range of issues, and this includes the installation of the running track in Everton’s new stadium," a Liverpool 2022 spokesperson said.

"They are very comfortable with what we are now proposing. 

"Indeed, since launching our plans in June, we have further strengthened a number of our proposals - including those relating to athletics - and are extremely confident that the solutions we are proposing are robust. 

"We plan to unveil more details on our hosting plans next month."

Both cities have already undergone an inspection from the Government as the CGDU, established by the Department for Digital, Culture Media & Sport and led by Nick Pontefract, formerly the senior civil servant responsible for sport for the Government, visited them earlier this month.

Their recommendations will be crucial in deciding which city is selected by the CGE.

The centrepiece of Liverpool's campaign is the riverside regeneration of the city’s Bramley-Moore Dock, the proposed site for Premier League club Everton’s new stadium.

Birmingham's bid includes extensive renovation work to the existing Alexander Stadium, the home of UK Athletics which has has been a host of International Association of Athletics Federations Diamond League athletics meetings.

It would stage athletics and the Opening and Closing Ceremonies.

The CGF have not revealed exactly when the host city for 2022 will be chosen although an announcement is expected in early November.

CGF chief executive David Grevemberg said in April that they had hoped to complete the process by mid-summer.

As well as Birmingham and Liverpool, Kuala Lumpur in Malaysia, Victoria in Canada and Adelaide, Melbourne and Sydney in Australia have expressed an interest in hosting the Games.

Their respective Commonwealth Games Associations have until September 30 to submit a formal bid to the CGF.

A review team, made up of CGF officials and international experts, is expected to review the merits of each bid in October.

Cities will then be given the chance to put their case to the CGF before a city is chosen the following month.