The AC Milan midfielder has failed to shine at San Siro since joining from CSKA Moscow but his coach expects him to play a pivotal role for his country in Brazil this summer
The 27-year-old has struggled since arriving at San Siro from CSKA Moscow in January but his boss believes that it is merely a case of the player adapting to the demands of a new league.
"Japan should have no doubts about Honda," Seedorf told reporters. "He's a great player and he's adapting to the Italian game.
"He played a great game [in Wednesday's win over Fiorentina] and got up and down the pitch well."
If selected by Alberto Zaccheroni, Honda would go to his second World Cup, having made four appearances and scored twice four years ago in South Africa.