The moves came after an emergency eurozone leaders' summit in Brussels.
The eurozone had asked Greece to submit fresh plans after its voters rejected a draft bailout in a referendum.
But Greece brought no written plans, suggesting instead a few changes to an earlier draft, which would respect "the mandate of the referendum".
On Sunday a meeting of all 28 members of the European Union will be held.
German Chancellor Angela Merkel said the eurozone leaders had a "serious, candid discussion" in Brussels that "reflected the seriousness of the situation at hand".
She said the leaders "obviously respect the results of the referendum" but also had a "shared responsibility" for the European Union.
Italian PM Matteo Renzi said Greek PM Alexis Tsipras was acting in good faith to provide sensible proposals to stave off the debt crisis.
The eurozone gives Greece until Thursday to present new proposals to secure a deal with creditors, and has called a full EU summit for Sunday.