The Eintracht Frankfurt attacking midfielder has been very impressive so far this season.
He has six goals in 12 games this term in all competitions, helping Frankfurt continue their upward trajectory from last season when they won the Europa League.
Per Sky Germany, the 26-year-old, who is out of contract next summer, will be offered a new deal that goes to 2025 at the very least.
He would also become one of the top earners in the squad with this extension.
However, it is unclear if the Japanese star is ready to sign on with Frankfurt, or if he wants to move to a bigger club when the season concludes.