Voluntary organisations in London were due to discover this week whether they will lose £9m.
The Association of London Government announced the cuts in July, claiming that the money would be redirected from cross-London voluntary sector services to local community organisations.
The announcement outraged charities in the capital, which claim that the cuts will threaten vital services that cannot feasibly be run by individual boroughs.
The executive grants committee of the Association of London Government was due to meet on Tuesday to decide what action it should take.
Tania Pouwhare, policy co-ordinator at the Women's Resource Centre and co-chair of the Voluntary Sector Forum, which has been lobbying against the proposals, said council leaders had told her there was no guarantee that the money wouldn't be used to reduce council expenditure, and that charities might have to lobby for the grants to be restored.