Ange Postecoglou has primarily opted to raid Asia when conducting his January business, and could potentially hand a Hoops debut to four new recruits. Christopher Jullien is back in training, in what's a big boost defensively for Celtic. Central midfield duo Reo Hatate and Yosuke Ideguchi have joined from Kawasaki Frontale and Gamba Osaka, respectively. Winger Daizen Maeda has followed in his former manager's footsteps by swapping Yokohama F. Marinos for Glasgow's east end. And young Irish centre forward Johnny Kenny has signed for Celtic, leaving Sligo Rovers in his homeland. Shaun Maloney has also been active in starting to sign some players as his Hibernian squad takes shape. Ewan Henderson has been loaned by Celtic, ineligible against his parent club here, before signing permanently in the summer. Former Ross County loanee Harry Clarke has swapped County for the capital, joining the Hibees on loan until the end of the season from Arsenal. Fellow defender Rocky Bushiri has signed on loan from Norwich City. Chris Mueller's move from Orlando is complete and Elias Hoff Melkersen has signed from Norwegian outfit Bodø/Glimt, who play Celtic in the Conference League next.