"We are sure that Mamataji won't join us (NDA), we have no confusion about it nor have we any apprehension about it," Modi said at an interview with news channel ABP Ananda.
He said this when asked whether his attack on West Bengal Chief Minister Mamata Banerjee was a fallout of BJP's failure to bring her party Trinamool Congress to NDA-fold.
The Gujarat Chief Minister, however, said he had hoped that Banerjee would be able to bring West Bengal out of the "mess created by the Left" as she had got sufficient time.
"Mamataji has got sufficient time to bring Bengal out of the mess created by the Left. But there are no such symptoms. So more than anger, I am disappointed with Mamataji," he said.
At a rally earlier this month in Siliguri, Modi had launched a scathing attack on Banerjee for allegedly indulging in votebank politics, drawing a sharp retort from Trinamool Congress which alleged he had 'blood on his hands'.
Asked about BJP's stand on the issue of separate Gorkhaland state in Darjeeling hills, Modi said "in this big country, if you try to dominate the regional aspirations by hitting on the wounds, then those wounds will increase. Sympathetically, you have to understand each and everyone's emotions, try to make them understand what way out can be reached through dialougues".
On whether there should be a CBI inquiry into the Saradha chit fund scam, Modi said "Look, in this chit fund scam, a lot of poor people have lost their money. There were a few people who even went to the verge of committing suicide.
"In such a situation, a step needs to be taken on which people have trust. Now what will be that form, that's a different issue. But steps need to be taken on which people can have confidence,".