Ryan Christie will undergo surgery this week after Celtic confirmed the Scotland midfielder suffered "multiple facial fractures" in his collision with Aberdeen's Dom Ball.
The 24-year-old was poleaxed by the Dons defender following a sickening clash of heads during Sunday's 3-0 William Hill Scottish Cup semi-final win.
Ball was shown a second yellow card by referee Craig Thomson after smashing into his opponent's cheek.
Christie had to be carried from the Hampden pitch on a stretcher wearing a neck brace but later released a picture on social media giving the thumbs up while sporting a nasty looking black eye.
However, Parkhead chiefs say they are not yet at a stage where they can predict when the former Inverness and Aberdeen playmaker will return as he prepares to go under the knife - placing his participation in next month's Scottish Cup final against Hearts in serious doubt.
A Hoops statement read: "Celtic Football Club can confirm that Ryan Christie has suffered multiple facial fractures following the incident during Sunday's Scottish Cup semi-final.
"Ryan is scheduled to undergo surgery on Thursday of this week. We are not able at this stage to give any specific indication on a timescale for his return to action but, of course, everyone at Celtic wishes Ryan all the best for his full recovery.
"Ryan would also like to thank everyone sincerely for the many wishes of support."