Okunki has scored four goals and provided two assists in the Bundesliga 2 across 15 appearances so far this season. It is suggested that the Scottish champions are yet to make a formal approach for the Japanese player but he is said to be one of their top targets for the upcoming January transfer window.
Celtic have started their January sales early with Japanese champions Vissel Kobe agreeing a 870,000 deal to sign forgotten on loan midfielder Yosuke Ideguchi, according to reports in his homeland.