The Belgian drama was viewed as another scenery generated by anti-globalization after Britain's shock referendum vote to leave the EU in June, adding uncertainty to the bloc's standing on its unity and solidarity as well as the capability to steer international negotiations.

The EU was further embarrassed and questioned, especially after it had hoped the CETA with such a like-minded country as Canada would lay the ground for the bloc's other trades deals with global powers including the United States and Japan.

Only cautious optimism was expressed from both the EU and Canada after the Belgian drama. Tusk said earlier he would only contact the Canadian prime minister after all procedures were finalized.

"Once bitten, twice shy," Trudeau was reported to comment on Thursday.

The CETA would remove more than 99 percent of tariffs that were currently imposed on trade between the EU and Canada and was expected to increase bilateral trade by 12 billion euros (about 13.2 billion U.S. dollars) per year, said the EU.

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