The European Commission gave no details when it said it was extending a deadline by 10 working days - from Dec. 14 to Jan. 6 - to examine commitments made by Kraft, based in Northfield, Illinois.
By that date, the EU's executive must approve the deal or open an in-depth probe that would examine problems more closely.
London-based Cadbury, the maker of Dairy Milk chocolate and Dentyne gum, plans to publish its formal response to the Kraft deal on Dec. 14.
Kraft, the maker of Oreo cookies, Nabisco crackers and its namesake cheese, took its offer straight to shareholders of the British candy company on Friday. In doing so, it bypassed the Cadbury board, which had already rejected an almost identical offer last month as "derisory."