Reuters reports on the matter
This just reaffirms a similar story by Bloomberg yesterday here.
The report by Reuters here adds that while officials may debate on the matter at the upcoming review on 19 March, the near-term focus will be "to keep yields stably low".
Besides that, the BOJ is reportedly said to possibly tweak its tiering system for deposits to exempt a larger portion of bank reserves from negative rates.
That is a move seen to mitigate the pain suffered by financial institutions and also be seen as a step that frees them to potentially pursue deeper rate cuts. The sources say:
"At the review, the BOJ will also lay out additional measures it would take to ease banking sector strains if and when it actually cuts interest rates."