Google Inc. chairman Eric Schmidt has responded by letter to concerns about his company’s possible abuse of its dominant market position in Internet search and advertising raised earlier this year by the European Commissioner for Competition, Joaquin Almunia.

Almunia’s spokesman, Antoine Columbani, confirmed receiving the letter Monday, but did not disclose details.

Almunia warned Google in May that it needed to quickly propose changes to the way it promotes its own offerings in search results.

“We have made a proposal to address the four areas the European Commission described as potential concerns,” said Al Verney, a Google spokesman in Brussels. “We continue to work cooperatively with the commission.”

Last week the commission closed its antitrust case against Microsoft after more than 10 years and a billion euros (dollars) in fines.