That could be a great chance for Kremlin critics to call elections unfair and undemocratic.
But Nikolai Konkin, secretary of the Central Elections Commission, said a check of the signatures found more than 80,000 to be invalid. In Russia presidential aspirants not affiliated with political parties must submit 2 million signatures supporting their bid to get on the ballot. Kasyanov's campaign said it turned in 2,067,000 signatures.
The Central Election Commission is expected to make a formal ruling on the issue later in the day.
Mikhail Mikhailovich Kasyanov (born 8 December 1957 ) was the Prime Minister of Russia from January 2000 to February 2004.
In 2006 Kasyanov stated his desire to run for President of Russia in 2008, he was nominated as a candidate in December 2007 and on 16 January 2008 he stated that he had finished collecting the 2 million signatures necessary to run as a candidate.
He is the leader of People's Democratic Union ( Russia ), ex-member of opposition coalition "The Other Russia".