By Leika Kihara

TOKYO (Reuters) -The Bank of Japan is considering slowing the pace of tapering in its bond purchases from next fiscal year onward, said four sources familiar with its thinking, a move that would signal its focus on avoiding big bond market disruptions.

The move would come in the wake of heightened volatility in the Japanese government bond (JGB) market, with super-long yields having spiked to record highs last month reflecting investors' concern over Japan's worsening public finances.

There is no consensus yet within the BOJ, as some prefer to maintain the current pace on the view the bank should focus on reducing its presence in the bond market, the sources said.

A final decision will be made at the BOJ's next policy meeting on June 16-17, when the board conducts a review of a current tapering plan that runs through March and comes up with a subsequent programme for April 2026 onward.

The BOJ received a sizeable number of requests from bond market participants to cut its quarterly taper size to around 200 billion yen, minutes of its meeting on May 20-21 with bank and financial institutions showed on Monday.

Some policymakers see such views as a reasonable ballpark figure, the sources said.

That would be half the size of the reduction under the current plan laid out last year, at which the BOJ cuts bond buying by around 400 billion yen per quarter until March 2026.

"The balance of opinions at the meeting will be a crucial factor in the BOJ's discussions on the taper plan," one of the sources said. The sources spoke on condition of anonymity as they were not authorised to speak publicly.

The BOJ began tapering its huge bond buying last year to wean the economy off decades of massive stimulus, and breathe life back to a market made dormant by its huge presence.

Though the BOJ still holds huge amounts of JGBs, some market players are now worrying that the steady reduction in the bank's bond buying could leave them vulnerable during heightened market volatility such as last month's sell-off in super-long bonds.

While many market players expect the BOJ to maintain or slightly slow the pace of tapering beyond April 2026, the BOJ has been mum on what the new plan could look like.

Having ditched a bond yield control policy last year, the BOJ is in no mood to ramp up bond buying in the wake of recent rises in super-long bond yields as medium and shorter-maturity bonds, as well as bank lending rates, remained stable.

But the volatility seen in the super-long JGB market has heightened awareness within the BOJ of the need to ensure its bond tapering plans do not destabilise markets, the sources said.