But Mogga, who has been eyeing the 29-year-old for several months, believes he'll be a key addition.
Mogga said: "Zheng Zhi is a player I have tracked for some time. He is a highly-regarded player and he was a thorn in our side when he played against us at West Brom.
"I am delighted that he may join us at Celtic.
"He will significantly add to the squad with his quality and the fact that he can play in a number of positions.
"We now need to tie up loose ends and obtain a work permit, which we hope to do before our next game."