A spokesperson for Newcastle Falcons said: "Following a precautionary x-ray last night on Jonny Wilkinson's shoulder and neck, Newcastle Falcons have announced that he will not be playing against VRAC Valladolid on Sunday 14th December 2003.
"He will have a further CT scan on Saturday morning to provide further medial information.
"This follows Jonny feeling some weakness and pain during training in the last week and the x-ray was taken as a precaution.
"The x-ray revealed an area of concern and had further investigations were warranted.
"Obviously the club will do nothing to put any player at risk from an injury standpoint and we feel this is the best course of action to take at this moment.
"We would like to stress that the injury was nothing to do with the car accident Jonny was involved in on Monday night."