BRUSSELS (Reuters) -EU antitrust regulators are set to open a full-scale investigation into the $36 billion bid by candy company Mars for Pringles maker Kellanova ( K ), people close to the matter said on Wednesday.

The European Commission is concerned about Mars' high market share in some products in some EU countries, the sources said.

Mars is unlikely to offer remedies to assuage such concerns during the EU competition enforcer's preliminary review of the deal, which ends on June 25, the sources said.