Yes. His contract ends in June 2020, so he has to renew for a further year, this is why his transfer to Partizan has been delayed for 3 weeks as Partizan could not afford to buy him now and Arsenal don’t want to loan him. Reports suggested that Savo Milosevic had to intervene by himself and use his connection to make this transfer happen, which is a very good indication of how much the club and its coach are eager to get Asano.
As I said, Partizan are fighting hard to get him, and they will do their best to make him deliver, and if he doesn’t, Milosevic will butcher him alive.