Under-pressure Japan coach Takeshi Okada took few risks in naming his country's 23-man World Cup squad.

Europe-based quartet Makoto Hasebe, Keisuke Honda, Daisuke Matsui and Takayuki Morimoto have all been included alongside Shunsuke Nakamura and 2009 Asian player of the year Yasuhito Endo ahead of Japan's Group E opener against Cameroon on June 14.

Playmaker Nakamura is expected to be fit for Japan's final World Cup warm-up against the Ivory Coast on Friday after the former Celtic midfielder missed the defeat by England due to an ankle injury, but played 90 minutes of a practice match on Monday.