Brendan Guilfoyle, the administrator who has been in charge of the ailing club since June 26, had expected to receive a formal bid on Wednesday afternoon from the group, known as the ABC consortium, but was still locked in protracted negotiations.
The consortium are thought to be the only definite bidders for the club, who have until July 27 to avoid liquidation, and Guilfoyle has pledged to hand over details of the offer to the Rugby Football League by the end of the week.
The potential new owners need to be ratified by the RFL as they aim to secure the Super League licence which was effectively relinquished when the club entered administration to avoid a winding-up petition by HM Revenue & Customs over an unpaid tax bill of more than £300,000.
The governing body say they will do all they can to help the club see out the rest of the season - they advanced monies due from the Sky television deal to enable Guilfoyle to pay the players' wages last week - but are unable to make any guarantees about 2013.
That could prove to be a major stumbling block, along with the consortium's stated desire to buy back the lease to the Odsal Stadium, which was bought by the RFL for £1.25million earlier this year.
The consortium, who include a number of property developers, have pledged to turn the Bulls into a multi-cultural club.
It is thought they would be able to acquire the club free of debt but must satisfy both the administrator and the RFL that they have the means to run the club for the next 18 months.