Singh, MP from Etah Constituency, has also resigned from the Lok Sabha.
Singh could not join BJP earlier owing to the fear of disqualification in Parliament as the outfit, Jankranti Party, he had formed after quitting BJP during 2009 Lok Sabha elections, merged with the BJP in January 2013.
At the time of merger, his party was headed by his son Rajbir Singh.
Kalyan Singh said he will join BJP would continue to work for it as common worker.
However, he has sought a nomination from his Etah constituency and would contest if given ticket.
Lauding the leadership of BJP’s prime ministerial candidate Modi, Singh said under him workers’ inaction has come to an end. ‘Modi’s leadership and workers’ action would help the BJP emerge victorious”, Singh said.
“There is a Modi wave as of now which would turn into a storm till the voting day,” Singh said, exuding confidence that the next government would be set up under Modi at the Centre.
“The country is faced with many challenges and people have to decide whether they wanted a firm or a indecisive government,” he said adding people have faith that they can get a strong and firm government under Modi.
Inflation and corruption are burning issues in these elections and Congress-led government had been successful in increasing both during its tenure, he quipped.