Speculation that the Bank of Japan will make some kind of policy move this month continues to build with the weak yen, higher bond yields and stronger-than-expected inflation fueling the market chatter.

A report by the Nikkei business daily over the weekend helped feed the growing expectations of possible BOJ policy action at its board meeting ending on Oct. 31. The central bank will likely ponder whether to tweak its yield curve control program at the gathering, it said.