The Ange Postecoglou era at Celtic is widely recognised for the club's exceptional recruitment. It is hard to believe that the Hoops signed the likes of Jota, Kyogo, Reo Hatate, Matt O'Riley, Cameron Carter-Vickers, Daizen Maeda, Liel Abada, Carl Starfelt, Josip Juranovic, Giorgos Giakoumakis and more in the same season.
Postecoglou has shown his eye for a talent at Tottenham Hotspur. It is no co-incidence that Celtic have struggled in terms of recruitment since the Australian's departure.
Of course, that does not mean that there no signings made by Celtic in the Postecoglou era which did not work out. There were quite certainly a few, especially in his second season at Parkhead.
Yuki Kobayashi is someone who falls under that category. The Japanese centre-back was brought in earlier this year and it led to the exit of Moritz Jenz. While the former has not gotten even a game for Celtic this season so far, the latter went on to establish himself in the Bundesliga and made a €8 million move from Lorient to Wolfsburg in the summer.
Postecoglou signing set to become Celtic's first January exit
Of course, Celtic won't be expecting to receive anywhere near that figure as the Japanese centre-back closes in on an exit. As reported by the Daily Mail (via Daily Record), Kobayashi is "likely" to join Yokohama F. Marinos and reunite with Harry Kewell.
Kewell was a coach at Celtic very recently, also arriving in the Postecoglou era, but recently left in order to become the manager of Yokohama F. Marinos. It looks like he could be set to reunite with Kobayashi there.
The move for Kobayashi has clearly not worked out for Celtic in more ways than one. He is not playing at the moment and it would make sense for all parties to part ways.