Daizen Maeda, Yosuke Ideguchi, and Reo Hatate will be in Glasgow in the next few days.
Daizen Maeda, Yosuke Ideguchi and Reo Hatate are three Japanese players who have signed with Celtic.
Ideguchi and Hatate have signed four-and-a-half-year contracts with Gamba Osaka and Kawasaki Frontale respectively.
Maeda arrives on loan from Yokohama F Marinos and will be permanent in the summer.
The trio are expected to arrive in Glasgow in the next few days.
"We are really pleased to bring in these guys to Celtic and I think they are players who will excite our fans," said Celtic manager Ange Postecoglou.
I think bringing all three to the club will bring even more quality, personality and energy to the squad and I think that will help the players who have done so well for us already this season.
"They are all at the peak of their careers, ambitious to achieve more success and I am sure at this particular time we will be getting their best years."
The trio will join Furuhashi at Celtic, with the forward having made a huge impact since arriving from Kobe with eight goals in his first 14 matches.
The top scorer in the J-League is a former player.
Daizen Maeda joined Yokohama F. Marinos after playing for Maritimo in Portugal.
He was the top scorer in the J-League with 23 goals, and made the division's team of the season, as his side finished second and qualified for the Asian Champions League.
After breaking through with Gamba Osaka, Yosuke Ideguchi went on to join Leeds United, where he spent time on loan in Spain and Germany before returning to his first club.
He has scored twice in Japan.
Reo Hatate is fresh from retaining the J-League title with Kawasaki Frontale and earning a place in the competition's best XI alongside Maeda.
He played in the bronze medal match of the Olympics in his homeland, Japan, when they lost out on a podium place to Mexico.
