BRUSSELS (Reuters) - Eurogroup chairman Jeroen Dijsselbloem said the bailout deal confirmed on Friday would get Greece's economy back on to a sustainable track. In a briefing following around six hours of talks, he also said he was optimistic the IMF would be willing to take part. "I think there is reason for optimism," he said. (Reporting by Alastair Macdonald and Barbara Lewis; Editing by Kevin Liffey)