Ivica Osim has picked a provisional 13-man squad for next week's friendly against Trinidad and Tobago.

The new Japan coach had reporters scratching their heads at JFA House on Friday after picking two goalkeepers and only 11 outfield players for the game at Tokyo's National Stadium on Aug. 9.

The ex-JEF United Chiba coach admitted that up to seven more players will be added to the squad depending on who is available.

Osim named World Cup hero Yoshikatsu Kawaguchi and Norihiro Yamagishi of Urawa Reds as his 'keepers, newcomer Yamagishi one of six Reds players in the squad.

Urawa defenders Alex Santos, Keisuke Tsuboi and new-boy Marcus Tulio Tanaka make up Osim's backline alongside Sanfrecce Hiroshima's Yuichi Komano.

There are first callups for Omiya Ardija's Daigo Kobayashi and Yokohama F. Marinos' Hayuma Tanaka, with FC Tokyo's Yasuyuki Konno and Urawa's Makoto Hasebe the other midfielders.

Tatsuya Tanaka, Sanfrecce's Hisato Sato and first-timer Kazuki Ganaha of Kawasaki Frontale are Osim's strikers.

"This roster is open still," Osim, 65, said. "It is possible that players who are playing abroad will be added.

"The squad is small because the schedule of the national team and clubs has crossed. I hope this won't happen again."

The squad plus late additions will also be the one used in the Asian Cup qualifier against Yemen on Aug. 16.