According to Team Talk, Borussia Dortmund are tracking Kaishu Sano with interest and have been in contact with his representatives.

According to Team Talk, Dortmund are making the most aggressive push in Germany to sign Kaishu Sano from Mainz. Mainz want €50-60m (£43-51m) for the player, whose contract runs for another two years.

Borussia Dortmund are among four major clubs, including Liverpool, Manchester United, and Arsenal, reportedly eyeing Mainz midfielder Kaishu Sano after his performance at the World Cup for Japan. Liverpool are showing strong interest in the 25-year-old. Sano's contract with the Bundesliga club has two years remaining, and reports in Germany from March suggested Mainz will only sell if a bid worth between €50-60 million is made. For Japan, Sano has 16 caps and 1 goal. In the 2025/2026 season in the Bundesliga, he made 34 appearances, scored 1 goal, and provided 3 assists. His current Transfermarkt market value is €40.00m.