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Government spokesman Steffen Seibert told a regular news conference that "it's not a meeting as such that will help Greece, it's a new (aid) package" that is currently being discussed at the level of eurogroupe finance ministers.
Officials in Brussels and other European Union countries earlier this week suggested a crisis summit could be held on Friday. Some later spoke of Monday.
"There is no concrete date," Seibert said.
"It's not a competition about fixing a date," he added.
Such a meeting should take place only "if it is meaningful and useful," once countries have agreed on a second package of financial aid for debt-strapped Greece, Seibert said.
Copyright AFP (Agence France-Presse), 2011