The Leicester fighter, who lost via a competitive decision to Nishioka in October 2010 for the WBC super-bantamweight title in Tokyo, remains hopeful of avenging one of only two losses on his 27-fight record.
“A good respectable fighter has left the game,” Munroe told World Boxing News.
“Nishioka has done himself and the boxing world proud and I hope he enjoys whatever he has planned for the future for him and his family.
“When I win the title I would definitely offer him a shot, although I think in the back of his mind he had already decided that the Donaire fight would be his last one.”
Munroe, 32, clashes with unbeaten Scott Quigg in a rematch of their short-lived first encounter in June, where a clash of heads ended the contest in the third round without either fighter getting the chance to warm-up.
The mouth-watering second bout features of the return of British great Ricky Hatton this weekend at the Manchester Arena and could potentially steal the show as the two fight it out for the interim WBA title at 122lbs.