(Reuters) - Greece has not managed to reach a deal with its creditors at the latest Eurogroup meeting in Luxembourg, the European Commission's Valdes Dombrovskis said in a tweet on Thursday. Strong signal for #Greece to engage seriously in negotiations," he said, adding that the group "stands ready to reconvene at any moment." Valdis Dombrovskis is EU Commissioner for the Euro and Social Dialogue. Euro zone finance ministers were meeting in Luxembourg for a session that had been billed as the final chance to reach a cash-for-reform deal.