Singh, who was elected to the Rajya Sabha for the fifth consecutive term yesterday from Assam, was asked by reporters on his way back from Japan and Thailand whether he will accept Prime Ministership, if the opportunity arises.
"When I filed my nomination papers, I had clearly stated that it has been my great privilege to represent Assam in the Rajya Sabha since 1991 and people of Assam have given me yet another opportunity to serve them," he said.
Last month, Singh had triggered speculation by remarking "I am not ruling it in, I am not ruling it out" when asked about him being a Prime Minister for a third term.
The Prime Minister's comments then had come days after Congress leader Digvijay Singh had said the two power centres had not worked well and should not be repeated.