Sources confirmed to CN that Keltbray was interested in several parts of the business, with discussions ongoing.

It is understood that around 60 people have expressed interest the specialist concrete contractor, although one source said this “varied from buying a wheelbarrow to the whole company”.

Administrators FRP Advisory have been working behind the scenes with other contracting groups to try and save jobs.

The Dunne group fell into administration on 19 July, after workers at Dunne Group and its subsidiaries are understood to have been pulled from multiple sites including 100 Bishopsgate, with Brookfield Multiplex.

The contractor was also working on One Blackfriars with Brookfield Multiplex as well as the Newington Butts project with Mace.

Construction News reported last week that Brookfield Multiplex had replaced Dunne Group on both its jobs with specialist contractor Byrne Group.

In its most recent accounts filed at Companies House, the group revealed turnover of £54.8m for 2014 with a pre-tax profit of £756,000.

It had boosted turnover from £37.1m the year before, when it had a pre-tax loss of £476,000. It had a liquidity ratio (assets divided by liabilities) of 1.1.

They added that the group had an order book of £181m for 2014 and 2015 at the time, with a further £65m of contracts at preferred bidder stage.

The Dunne Group received a £50,203 county court judgement on 12 July, according to credit reference and debt recovery agency Top Service, although there was no reason given as to why it was issued. It has had no other issues with late payment.