Reported shirt sales hit 10,000 within six days and the BVB jersey is now claimed to be the most popular in Japan .
Sporting director Michael Zorc even admitted that Dortmund decided not to officially present the player because the signing needed no further hype .
Reported shirt sales hit 10,000 within six days and the Dortmund jersey is now claimed to be the most popular in Japan .
Sporting director Michael Zorc even admitted that Dortmund decided not to officially present the player because the signing needed no further hype .