Pierre Kalulu was injured recently and he will be absent in view of the Napoli game this weekend, at least. This is not exactly the news the fans and the club were looking forward to hear. The medical examinations which the Frenchman underwent brought to light an injury to his right calf.
Here is a press release, relayed by those at Calciomercato.com:
"This morning, Pierre Kalulu underwent follow-up exams that revealed an injury to the soleus muscle in his right calf. Another instrumental check will be carried out in a week."