Japan head coach Jamie Joseph on Thursday urged his players to cut out "small mental lapses" when they face Fiji in their final home game before the Rugby World Cup.

Joseph made four changes to the team that beat Tonga 21-16 last week as Japan look for a successful send-off against the in-form Fijians in Tokyo on Saturday.

Joseph said his team "came back to some of our best rugby" against Tonga after losing 24-22 to Samoa the previous week.