Regulators may eventually require banks to maintain a Tier 1 capital ratio of 9%, PNC Financial Services Group Inc.'s chief executive predicted.

"It appears as if 9 might be a more acceptable level," James Rohr said Tuesday in New York at a Barclays financial services conference. Tier 1 capital ratios are a key measure of banks' financial health and regulators have historically required banks to maintain a Tier 1 ratio of 6% in order to be considered "well capitalized."

More recently, regulators have informally pushed banks to raise their ratios to 8%. But Rohr's comments suggest those standards may soon rise more.

Finance officials from 20 industrialized nations will soon gather in PNC's hometown of Pittsburgh, and observers expect the group to address regulation of banks.

Rohr said PNC's charge for current and future loan losses in the third quarter will be equivalent to the banking company's provision in the third quarter. He said the charge will add to PNC's reserve for future loan losses, meaning it will exceed the company's third-quarter chargeoffs.

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