Modi is the chairman of the BJP's election campaign committee.
"Gadkari came to attend a social function in the state and paid a courtesy visit to Modi," said BJP spokesperson I K Jadeja.
He was evasive when asked about what transpired at the meeting between the two leaders.
"They must have discussed some political issues. But I don't know what transpired in the meeting," he said.
The former BJP president was also entrusted with the responsibility of preparing the vision document, highlighting achievements of erstwhile NDA government, which will be released with the party's election manifesto.