SHANGHAI/BEIJING, June 30 (Reuters) - China's central bank has surveyed some foreign banks in the past week about the interest rates they offer to their clients for dollar deposits, two sources with direct knowledge of the matter said.

The central bank also guided one commercial lender to lower such rates, one of the sources said, as recent weakness in the yuan prompts authorities to more closely scrutinize foreign exchange dealings. But the source did not offer more details.

The move could potentially nudge companies, especially exporters, to convert more of their foreign exchange receipts into the yuan, which has weakened to near eight-month lows and lost nearly 5% so far this year.

The survey came weeks after sources told Reuters that a self-regulatory body overseen by the central bank had told major state-owned banks to lower dollar deposit interest rates.

The People's Bank of China (PBOC) did not immediately respond to Reuters requests for comment.