The ECB declined to comment.
The ECB has an estimated €40-45 billion ($52-59 billion) in Greek debt holdings, and is Greece's single largest creditor.
We've been writing about the futility of efforts to avoid a credit event in Greece for a long time, particularly because the size of the Greek CDS market is small and some of its effects have already been priced in.
So we have to ask, what's it going to be, ECB: credit event or taking losses on Greece?
Regardless of the seeming polarity of choices the ECB has here, investors are skeptical that the central bank will go down without a fight.
"If you're big enough, you can walk like a duck and not be a duck," said Ari Bergmann, Managing Principal at Penso Advisers LLC at a conference sponsored by Bloomberg Link yesterday, suggesting that Greece could be too big to trigger CDS contracts. "[When we wrote our first soverign CDS contract] we wrote then that there are 10 to 20 ways of defaulting without triggering a default."