Daizen Maeda will be joining Celtic on an initial loan deal.
The Parkhead club could make the deal permanent in the summer if they wanted to.
Sky Sports News reported earlier this month that the forward was one of Celtic's targets, with the club still considering moves for Reo Hatate and Yosuke Ideguchi.
Daizen Maeda was awarded the golden boot in the J-League.
Maeda was the joint top scorer in the J-League last season, and he was in the best XI.
It would be Celtic's second signing from the J-League, after bringing in forward Kyogo Furuhashi, who has scored 16 goals in all competition this season.
January transfers are Postecoglou's goal.
January signings should be made as early as possible to give incoming players time to get to know the squad, Postecoglou told Sky Sports News.
The Celtic manager said fans shouldn't expect as many arrivals as they did in the summer.
If we can get them in from when we restart training and give them a lead into the second half of the year, it would be ideal.
I don't think I will ever go through another transfer period like I did when we had to bring in 12.
He will not take time off during the winter.
I know what we want, we've been working on it for a long time, so we can be a little more measured.
It's not a precise science, but hopefully we get the ones we want early on.
Jackson said that Kyogo has raised expectations.
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The supporters will be expecting any new signings from the Asian market to impress, according to former Celtic player and Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr Swirlr
Sky Sports News spoke to a former Celtic player.
I think they will be happy if they are half as good as Kyogo. He has been a sensation since he arrived.
The manager knows the market, he knows the players, and he's very confident in bringing them in, but the fans will grow used to it.
The bench is not as strong as it should be. Trying to change things during a match has been difficult for the manager.
It's very important that they strengthen the squad in January becauseKyogo doesn't need a rest.
Sky Sports has all the latest.
Sky Sports has a dedicated Transfer Centre blog where you can keep up-to-date with all the latest news. Sky Sports News has the ins, outs and analysis.
