If the Banks are "happy" to rollover their Greek debt then why are the credit rating agencies not playing ball and threatening to downgrade Greece to d?

如果银行业“乐意”展期希腊债券，那信贷评级机构为什么不认同还威胁下调希腊评级至违约呢？

youdao

For US banks in particular, there's an important question whether this encouraged rollover of loans would oblige them to pay out under the credit derivative contracts they may have written to insure the debt.

BBC: Eurozone woes are US woes