The EU has demanded that Google make major concessions relating to its $2.1 billion acquisition of fitness-tracking company Fitbit if the deal is to be allowed to proceed imminently, according to people with direct knowledge of the discussions.

Since it was announced last November, the acquisition has faced steep opposition from consumer groups and regulators, who have raised concerns over the effect of Google’s access to Fitbit’s health data on competition.

EU regulators now want the company to pledge that it will not use that information to “further enhance its search advantage” and that it will grant third parties equal access to it, these people said.