Bank of Japan deputy governor nominee, Masazumi Wakatabe, staked out an aggressive position in front of a Lower House committee on Monday, stating that "there are no limits to monetary policy."

His comments stood in stark contrast to his future co-worker, deputy governor nominee Masayoshi Amamiya, who instead stressed that monetary policy must also take into consideration financial stability.

Their differences foreshadow a looming battle within the central bank's Policy Board over how and when to exit one of modern history's greatest monetary experiments.