Karnataka Chief Minister Siddaramaiah on Tuesday said the ruling Congress has made all necessary preparations for the November 13 Assembly by-polls in three segments in the state, and the candidates are likely to be announced later in the day. He said, while it has been decided to give Sandur ticket to Bellary MP E Tukaram's wife Annapurna, candidates for Shiggaon and Channapatna segments will be decided by the party. The last date for filing nominations is October 25, and the final date for withdrawal of papers is October 30. By-polls for Sandur, Shiggaon, and Channapatna are necessitated, as the seats fell vacant following the election of their respective representatives -- E Tukaram of Congress, former CM Basavaraj Bommai of BJP, and Union Minister H D Kumaraswamy of JD(S) -- to Lok Sabha in May elections. "We have made all the preparations (for bypolls), probably candidates may be announced today. The Sandur candidate has been decided, we will give the ticket to Tukaram's wife.