Read MoreBOJ's Kuroda vows to hit price goal, stands ready to do more
The minutes offered no hints of the BOJ's surprise decision on Oct. 31 to expand its government debt purchases, but they do show more concern about the price outlook in the short term.
"Some members noted that, depending on developments in energy prices, the year-on-year rate of increase in CPI might temporarily fall below 1 percent," the minutes said.
At the Oct. 6-7 meeting, the BOJ left its quantitative easing program unchanged despite lingering weakness after a sales tax increase in April.
Read MoreJapan inflation slows in September, increasing pressure on BOJ
At a subsequent meeting on Oct. 31, the BOJ stunned global investors by increasing its government debt and risk asset purchases in a tightly split 5-4 vote that raised questions about whether factions on the board could hamper future policy decisions.
Many economists took the extra easing as a stark admission that the BOJ's attempt to guide consumer inflation to around 2 percent sometime next fiscal year is not going well.
Kuroda had previously stated that there was no chance inflation will fall below 1 percent, excluding the impact of a sales tax hike in April.
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However, a large decline in oil prices made Kuroda's prediction increasingly unlikely, which could have swayed some members on the board.