According to Bild, the Rheinhessen plan to demand a transfer fee of up to 50 million euros for Kaishu Sano.

Kaishu Sano's teammate, Danny da Costa, said he hopes to have Sano as a teammate for some time, but that it is uncertain how things will develop. It is suggested that there is no serious expectation in Mainz that Sano will still be there next season, despite him having a contract until 2028 and no release clause. The club expects a bidding war from mega top clubs and is targeting at least 60 million euros in transfer fees. This fee is considered realistic at this time.

Kaishu Sano is a 25-year-old Japanese defensive midfielder at Mainz. Despite having a contract until 2028, few in Mainz expect Sano to stay beyond the summer. Bidding for him from clubs across Europe is expected. Several Premier League clubs have already made inquiries. Sano joined Mainz in July 2024 and has made 27 appearances in the Bundesliga this season, scoring one goal and providing two assists. He has been capped 12 times for Japan. His current Transfermarkt market value is €25.00m.