Boumsong suffers injury blow
The French international, who is set to join Rangers in the summer, sustained the injury in Saturday's draw with Bastia.
The 24-year-old now faces an operation and he is set to be sidelined for a number of months.
The injury could raise doubts over his participation at Euro 2004 with France, but Boumsong is hopeful of making a quick recovery.
"I took a huge blow in the face in the game against Bastia.
"I'm suffering from a fracture of my left eye socket and a small cranial trauma. I had a scan and X-ray in hospital and they confirmed it was a fracture."
"I expect that I will be out for a number of weeks.
"In the immediate future I will have to see a specialist, who will decide whether I will need an operation.
"At the moment I have a massive headache. My sinuses are full of blood, although there is no internal bleeding.
"One thing is certain, and that is that I was frightened. I was knocked completely cold.
"When it happened I at first saw double, then nothing at all.
"I am not at the peak of my form right now - that is for sure.
"But I really hope to be back playing as soon as possible."