Few would have given Japan much chance of getting out of a group that included Germany and Spain when the World Cup draw was made but a win over Costa Rica on Sunday would leave Hajime Moriyasu's side on the brink of the last 16, reports Reuters.
The Japanese came from behind to beat four-times champions Germany on Wednesday and will face a Costa Rica side reeling from their 7-0 thrashing by Spain in their Group E opener.
Costa Rica, who suffered their heaviest ever defeat at the World Cup finals, are unlikely to provide as stiff a test as the Germans.