Anti-capitalist protesters will be told to remove their tents outside St Paul's Cathedral or face legal action.
The City of London Corporation will hand over a letter warning the group that it has 48 hours to clear its campsite or High Court action will be taken to secure their eviction.
On Monday the row claimed another victim as the cathedral's Dean, the Right Rev Graeme Knowles, resigned saying his position was "untenable". His departure followed those of Canon Chancellor of St Paul's Giles Fraser and part-time chaplain Fraser Dyer.
The Dean made the initial announcement that the historic cathedral, in London, had closed its doors for the first time since the Second World War because of fears over health and safety.
He asked demonstrators to move on, while the former canon chancellor and chaplain resigned because of the way the controversy had been handled, revealing divisions within the cathedral.
The Archbishop of Canterbury Dr Rowan Williams said: "The events of the last couple of weeks have shown very clearly how decisions made in good faith by good people under unusual pressure can have utterly unforeseen and unwelcome consequences, and the clergy of St Paul's deserve our understanding in these circumstances.
"The urgent larger issues raised by the protesters at St Paul's remain very much on the table and we need - as a church and as society as a whole - to work to make sure that they are properly addressed."
St Paul's and the City of London Corporation announced on Friday they would try to obtain separate High Court injunctions to clear the 200-tent Occupy London camp.
The protesters say they are preparing to respond to any legal action. Ian Chamberlain, 27, from Occupy London Stock Exchange, said: "They have to serve that notice and give us 48 hours so there is room for us to respond with legal action or whatever.
"Our invitation for dialogue is still there. Liberty offered to facilitate a meeting to have dialogue with the Corporation of London and they haven't responded yet. We will stay here right until the end and explore legal options to respond to any eviction notice we do receive."