Additional security forces have been deployed across the city including in and around Banaras Hindu University, Kashi Vidyapeeth and Vishwanath temple which are likely to be visited by Modi during his visit to the city on Thursday.
Sources said the police team from Gujarat is holding back-to-back meetings with the top officers of local administration here for security of Modi, who will be filing his nomination following a roadshow in the heart of the city.
April 24 is the last day of filing of nomination for Varanasi constituency where election will be held on May 12.
Gujarat's Chief Minister has been challenged by Aam Aadmi Party leader Arvind Kejriwal in the constituency along with a number of other contestants including Congress' Ajay Rai.
The BJP's Prime Ministerial nominee will arrive at Lal Bahadur Shastri airport on Thursday morning from where he is likely to go to Banaras Hindu University by a helicopter.