BRUSSELS--The European Union's antitrust chief signaled Thursday that his institution will review Liberty Global's planned EUR6.9 billion ($9.5 billion) acquisition of Dutch cable operator Ziggo, and criticized a plea by Dutch authorities to take over the case.

The deal, if approved, would give John Malone's international cable company access to 90% of Dutch households due to its ownership of the second largest cable operator, UPC.

Investors are watching closely to see which antitrust authority will review the merger because the decision is likely to affect the timing and conditions of any judgment, and yield clues as to how regulators will treat future mergers in Europe's rapidly consolidating telecoms sector.

"In the case of Ziggo in the Netherlands...it is obvious that this is an EU case, and they have notified and we are working on this," Joaquín Almunia, European commissioner for competition, he said.

While the Ziggo deal exceeds the sales thresholds that require it to be notified to the European Commission, the EU's central antitrust authority, the commission can choose to refer it back to the Dutch national regulator if it considers the merger affects mainly national interests.

Mr. Almunia pointed to "the other part of Liberty Global" as a reason for the merger's EU dimension. Liberty is active in 14 countries and has major units in the U.K., Belgium and other EU countries.

"When the commission is competent, the normal rule is that the commission deals with this merger," Mr. Almunia said. "And this is what is going on both in the German case or in the Dutch case," he said, referring to both the Ziggo merger and to Telefónica Deutschland's proposed takeover of E-Plus, the German unit of KPN Mobile NV--a deal that the commission decided to handle itself.

Mr. Almunia also criticized an unusually impassioned plea last week by the Dutch regulator that it should be the one to assess the merger.

In a statement, Chris Fonteijn, chairman of the Dutch regulator, known as the Authority for Consumers and Markets, argued that his authority knows "best what is happening in the Netherlands."

"What I don't understand is what the Dutch competition authority did the other day," Mr. Almunia said.

"Say "Hey, hey! I am much more clever than you! Give me this case!" No. I was surprised by this," the commissioner said.

Liberty and Ziggo are keen that the merger be reviewed in Brussels, which would lead to fewer political sensitivities and a shorter, defined timeline, according to people familiar with the matter.

The commission will make its decision on which authority will review the Ziggo merger by May 8.

Write to Tom Fairless at tom.fairless@wsj.com

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