The bank also confirmed it had received indicative offers from interested parties since Chancellor George Osborne announced in June his decision to put Northern Rock up for sale.
After its near-collapse, Northern Rock was split into a “good bank” comprising new mortgages and savings, and a “bad bank” holding its toxic assets.
The “good bank” is the part being sold, while the government continues to wind down and run off the “bad bank’s” toxic assets although these could also be sold to a private party.
The Northern Rock sale is being handled by Britain’s UKFI organisation, which was set up to manage the state’s holdings in banks bailed out during the crisis.
“We are working closely with UKFI and our advisers to explore the options for a sale of Northern Rock, at the right time and in the best interests of taxpayers,” Northern Rock Chairman Ron Sandler said in a statement.
“We are pleased with the level of interest we have received, and will continue to explore the sale option over the coming months,” he added.