The BJP president had a 30-minute meeting at Advani's residence today afternoon on the issue which the Parliamentary Party chief is opposed to.
Advani had announced his resignation from all BJP posts immediately after Modi was anointed as head of the party's election Campaign Committee, but was convinced by RSS to withdraw it.
However, indications are that Singh's efforts in convincing Advani on Modi's candidature have not borne fruit as the BJP patriarch has not given any assurance on it.
While stepping up efforts on the issue of announcing Modi's name, former BJP President Nitin Gadkari had met Advani as an emissary of RSS yesterday. Gadkari left for Nagpur yesterday itself to convey Advani's thinking to RSS, which has its headquarters there.
Gadkari visited Advani at his residence here and held a short meeting with the senior leader to convince him on Modi's name and agree to a date for convening a meeting of the Parliamentary Board before September 17, party sources said.
Advani, Leader of the Opposition in Lok Sabha Sushma Swaraj, and Murli Manohar Joshi reportedly have reservations on declaring Modi as the PM candidate before the Assembly elections in Madhya Pradesh, Chhattisgarh, Rajasthan, Delhi and Mizoram.