The midfielder did the damage against Norwich on Saturday - and will be out of action for around six weeks.
Chelsea has confirmed: "Scott Parker has suffered an injury that will keep him out of action into the new year."
They added: "An x-ray showed he had suffered a broken metatarsal bone. A likely date for his return is not yet known."
What is it about metatarsal bones?
This news is on the heels, sorry about pun, that Ricardo Carvalho is also out for a number of weeks as he too broke a bone in his foot when he played against Porto in Portugal in the Champions League.
He played in the following game against Arsenal with the injury but was substituted.