May 28 (Reuters) - Good news of a tentative deal for the U.S. debt ceiling impasse may quickly turn out to be bad news for financial markets. "That's where the debt ceiling matters." In that case, "the impact on broader financial markets would likely be relatively muted," Daniel Krieter, director of fixed income strategy, BMO Capital Markets, said in a report. Some bankers said they fear financial markets may not have accounted for the risk of a liquidity drain from banks' reserves. Bankers put it to hope that the debt ceiling impasse would be resolved without significant dislocation to markets, but warn that's a risky strategy.

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