Bank of Japan policymakers will likely debate the possibility of easing monetary policy further at a rate review this month, as a raft of gloomy data threatens their scenario that a moderate economic recovery will accelerate inflation towards a 2 percent target, sources familiar with their thinking said.

If the central bank were to act, it would more likely increase asset purchases than cut interest rates, the sources said, as financial institutions are still scrambling to adjust to a negative rate policy deployed in January.