Whitehall insiders had expected an announcement before Christmas and are growing increasingly concerned that a chief will not be in place before the OGC officially begins work on 1 April.
According to the Treasury, however, "an announcement will be made by the end of the month and we expect the new head to be in post by the time the OGC is up and running on 1 April".
The OGC will be responsible for defining the Government's electronic procurement agenda. It will oversee the management of supplier relations and offer project management skills across departments.
The OGC will create an "electronic shopping mall", which it hopes will knock £13bn off the government's annual procurement budget.
These savings depend, however, on meeting Tony Blair's target of conducting 90% of routine government purchasing online by 2001.