But in a sign of the state of uncertainty surrounding the efforts to stabilise Greece's finances, the eurozone's top financial official denied the claim.
Spanish Economy Minister Luis de Guindos said at a conference in the northeastern city of Pamplona that a new bailout would provide between 30 billion euros and 50 billion euros. Its "central scenario for Greece is a deal on the basis of the current bailout, and new conditions to be set with flexibility."
Soon after those comments, the spokeswoman for the leader of the Eurogroup, the gathering of eurozone finance ministers of which de Guindos is a member, said she was unaware of talks for a third bailout.
The bailout that de Guindos outlined "is not something that is being discussed," said Simone Boitelle, the spokeswoman for Jeroen Dijsselbloem, who is both finance minister for the Netherlands and chairman of the Eurogroup.
A Greek finance ministry official, speaking only on condition of anonymity, likewise denied there were any talks. Prime Minister Alexis Tsipras has ruled out a third bailout. Greece received a four-month extension on its rescue loans agreement but will need to make reforms in order to get more money. It faces a cash crunch as early as this month.