Virgin Money is being heavily linked to a bid for the network of Royal Bank of Scotland branches that failed to be bought by Santander.
The Sir Richard Branson-backed bank, which took control of nationalised Northern Rock in January, was said to have been "very keen" on the business when it was up for sale in 2010 and is now considering the opportunity to rebid.
Buying the RBS division would more than quadruple Virgin's branch network and add a small and medium-sized business bank to its offering.
Thousands of workers are facing mounting uncertainty over their jobs after the collapse of a proposed sale of RBS branches to Santander.
The chief executive of the RBS said it was "disappointing" that a proposed sale of 316 branches to Santander had collapsed.
Royal Bank of Scotland's deal to sell branches to Spain's Santander has collapsed, with one source saying it is "a major blow".