Kioxia Holdings Corp.’s lenders plan to submit a commitment letter in October for the refinancing of ￥2 trillion ($14 billion) in loans to help fund the merger with Western Digital Corp.’s flash memory business that’s still under discussion, according to people familiar with the matter.

The letter being prepared is from banks including Sumitomo Mitsui Financial Group Inc., Mizuho Financial Group Inc. and Mitsubishi UFJ Financial Group Inc., the people said, asking not to be identified because the matter is private. This would mark a step forward in the merger, which has faced months of delay.