The bonds rallied after the announcement as concern eased that a steeper downgrade would make its debt ineligible as collateral at the European Central Bank.
Further cuts from Moodyâ??s, which kept a negative outlook on the rating, would cast doubt on the eligibility of Greek debt at the ECBâ??s money market operations. Moodyâ??s is the only major ratings company grading Greece above BBB+ after cuts from Standard & Poorâ??s and Fitch Ratings earlier this month. A downgrade of two more notches would mean Greek bonds wonâ??t be accepted by the ECB if it reverts to its pre-crisis collateral rules in a yearâ??s time.