He underwent surgery for a depressed fracture of the skull.
The operation was successful but it is too early to give an accurate assessment of his condition.
Naturally everybody at Chelsea wishes Petr, and Carlo Cudicini who was discharged last night after being knocked unconscious, a speedy recovery from their injuries.
Chelsea FC has reviewed the video of both incidents. We endorse the post-match comments of Jose Mourinho regarding the seriousness of these incidents.
Chelsea will be writing to the Football Association with our observations.