The Asia-focused lender has around around $6 billion of exposure to real estate in Hong Kong, and $1.25 billion in China out of a global real estate portfolio of some $19 billion, he said.

"We need to be careful that we don't overreact, in this instance we don't have any significant exposure, the overall sectoral exposure is very modest and we're much, much less concerned than the initial market reaction," he said.

(Reporting By Lawrence White, editing by Iain Withers)