A decision in this regard was taken at the NDA leaders meet here today, BJP State President Kummanom Rajasekharan told reporters.
The candidate for the by-poll would be decided soon, he said.
Former party president P S Sreedharan Pillai, whowas the candidate in the 2016 assembly election in the segment, was one of the names considered for the bypoll.
The by-poll was necessitated as CPI(M) MLA K K Ramachandran Nair who won the Chengannur in 2016 polls, passed away in January 2017.
"The BJP and NDA have a strong presence in Chengannur and we will win the by-poll," Rajasekharan said.
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Slamming the CPI(M) led LDF government in the state, Rajasekharan alleged that political killing has become a daily affair in the state.
The government was trying to 'sabotage' corruption cases to save the corrupt, he added.
Thushar Vellapally, President of BDJS, the second key partner in the NDA in Kerala, was among those who took part in the meeting.