Bank of England policymaker Paul Fisher said the central bank's latest 75 billion pound cash injection into the economy was the minimum it needed to do and he thought it may need to add to it.
I still think we might need to do some more, he told the Sunday Times newspaper in an interview.
The Bank restarted its quantitative easing programme in October to give a boost to Britain's flagging economy.
The Bank sharply downgraded its expectations for growth and inflation for 2012 in its latest projections this month, signalling it may further expand its 275 billion pound asset purchase programme.
Most economists reckon the Bank will pump a further 50 billion pounds into the economy when the current programme of purchases ends February
(Reporting by Tim Castle; Editing by Fiona Shaikh)