Japan coach Alberto Zaccheroni says there were plenty of positives to take from the national team's mini-camp and has not ruled out deploying an unfamiliar 3-4-3 formation for the Asian champions' final World Cup qualifying warm-up against Azerbaijan in Shizuoka on May 23.

"Over these three days the communication has been good and we have been making an effort and discussing a system the players are not normally used to," Zaccheroni told reporters Wednesday as the three-day get-together for J. League players wrapped up in Chiba Prefecture.

Japan drew 0-0 with the Czech Republic and Peru in June last year and labored past minnows Vietnam 1-0 the last time they operated with a 3-4-3 shape that many players have grumbled about not being able to get to grips with.