The euro zone acknowledged for the first time some form of Greek default may be needed to cut Athens' debts, but markets seized on the lack of a deadline for action and a lukewarm response from the IMF to heap pressure on Italy and Spain, Reuters reported. Dutch Finance Minister Jan Kees de Jager said on Tuesday euro zone finance ministers had effectively accepted that if they wanted to have the private sector involved in a second bailout of Greece, a selective debt default was likely, despite the European Central Bank's vehement opposition to such a move. "We have managed to break the knot, a very difficult knot," he told reporters as he arrived for a second day of talks. Asked about whether a selective default was now likely, he replied: "It is not excluded any more. Obviously the European Central Bank has stated in the statement that it did stick to its position, but the 17 (euro zone) ministers did not exclude it any more so we have more options, a broader scope." Participants said both a buy-back of Greek debt on the secondary market and a German proposal for a bond swap for longer maturities were under consideration after a complex French plan to roll over bonds made no headway.