"I think around 300 people will attend," Churov told journalists.
The official also said the number of observers would not affect the results of the polls, which should be recognized by "any country maintaining diplomatic relations with us."
A CEC member said last Friday around 350 accredited monitors were expected to attend.
The Organization for Security and Cooperation in Europe's Office for Democratic Institutions and Human Rights (ODIHR) and the OSCE Parliamentary Assembly last Thursday announced that they would not monitor the polls due to restrictions imposed by Russian election authorities.
The Russian Interior Ministry said earlier on Wednesday that 450,000 personnel will be deployed to ensure security at the election.
Presidential candidate First Deputy Prime Minister Dmitry Medvedev, backed by incumbent Vladimir Putin, is likely to secure a landslide victory on March 2.
