India's central bank announced on Monday a host of measures to inject liquidity into the banking system, including bond purchases and dollar/rupee swaps, which analysts and traders said could be a precursor to a rate cut next month.

MUMBAI, Jan 27 (Reuters) - Indian government bond yields plunged at a start of a busy week, with the 10-year plummeting to a three-year low, as surprise bond purchases by the central bank boosted investor sentiment.

RBI announced measures to infuse over Rs 1.5 lakh crore in money markets to address liquidity shortfall. The plan includes government bond buy-backs, a long-term repo auction, and a dollar-rupee swap auction.

The Reserve Bank of India's unexpected purchase of government bonds pushed down bond yields on Monday and raised bets for a cut in interest rates in February, investors said.