Yuya Osako scored a double on his return to the national team as Japan warmed up for next week's World Cup qualifier against Saudi Arabia with a 4-0 friendly win over Oman on Friday.

Osako had not appeared for Japan since a 0-0 home draw with Singapore in June 2015, but the Cologne striker wasted no time in making his mark with goals in the 32nd and 42nd minutes at Kashima Stadium.

Hiroshi Kiyotake added another from the penalty spot in the 64th minute and substitute Yuki Kobayashi notched a fourth in injury time, to ensure that Japan heads into Tuesday's crunch game against the Saudis at Saitama Stadium with the wind in its sails.