Google’s $2.1 billion deal to acquire fitness tracker Fitbit will face a European Union antitrust investigation next week, reported Reuters. The tech giant on Wednesday was grilled at an antitrust hearing by the US Congress that had raised concerns about their competitive tactics.

The acquisition, which happened in November last year, had spelled trouble for Apple and Samsung who were leading the fitness tracking and smartwatch industry.

In an attempt to acknowledge the concerns raised by the EU antitrust panel, Google had said that it will not use the health data from Fitbits to target ads. However, the launch of the full-scale investigation clearly suggests that the probe panel is dissatisfied with its decision.

The panel is expected to complete its preliminary review by August 4. Post the review, the panel will investigate the use of data in health care. There were several concerns following the Google-Fitbit deal. The company had drawn flak from privacy advocates and rivals, for its dominance in the online search market and usage of customer data.

In the US Congress’ antitrust hearing Google was accused of destroying user privacy and anonymity on the internet.