“We’re very pleased that Shinji will play for us for another three seasons,” Dortmund sporting director Michael Zorc said as the club arrived in Tokyo on Friday on its pre-season tour.
“Shinji identifies with our club, the city and the fans. He’s also an important role model for our young team.”
The 28-year-old has scored 54 goals in 185 appearances for Dortmund over two spells, winning the Bundesliga twice in a row following his arrival in 2010.
He rejoined the club in 2014 after a couple of seasons with Manchester United.
Download our app and read this and other great stories on the move. Available for Android and iOS.