"I am told that a list of Congress candidates for Karnataka election is under circulation. The AICC has not approved the list of candidates yet. The list under circulation is fake," he said in a tweet.
The senior Congress leader said the fake list has been circulated to create confusion among the masses.
"Please don't patronise products of the #FakeNews factory," he said.
The Karnataka chief minister was in the national capital to attend the party's steering committee meeting to screen the candidates for the state polls.
Karnataka Pradesh Congress Committee president G Parameshwara, state in-charge K C Venugopal and senior leader Madhusudan Mistry among others were present in the meeting.
After the steering committee meeting, Siddaramaiah left for Bengaluru and is likely to visit the national capital again on Friday to finalise the list.
The BJP has already announced its first list of candidates for the Karnataka polls to be held on May 12.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)