Karunanidhi made the announcement in his concluding remarks at the meeting of the party's key decision-making body, the general council, on Sunday to rapturous applause from members, reflecting the anti-Congress mood in the party ranks.
Party sources claimed that Karunanidhi hinted that DMK may not forge an alliance with BJP also but the leader himself made a non-committal reply on this.
Sources said he had indicated that BJP's present leadership was different from A B Vajpayee who had headed the NDA government of which DMK was a constituent.
"A committee has been formed and it will discuss and decide on the alliance," was his response to reporters' queries when asked if he still kept BJP as an option.
DMK sources present at the meeting said Karunanidhi ruled out a tie-up with Congress, referring to the 2G spectrum scam which has turned out to be the gravest allegation faced by DMK in many years.
Karunanidhi's daughter Kanimozhi and junior colleague and former Telecom Minister A Raja are accused in the scam.
The Joint Parliamentary Committee, constituted to probe the matter and headed by P C Chacko (Cong) had recently tabled its report in Parliament amidst opposition from BJP, CPI and TMC which has dubbed it as "fraud".
DMK members had walked out in protest over the report.
The report has given a clean chit to Prime Minister Manmohan Singh in the scam, saying he was "misled" by the then Telecom Minister Raja. DMK has said that Raja was not heard.
Earlier, the General Council granted complete authority to Karunanidhi and party General Secretary K Anbazhagan to discuss and decide alliance-related issues for the 2014 Lok Sabha elections.
"This General Council gives complete authority to party president, general secretary to contact alliance parties, discuss seat sharing and announce a committee to take forward alliance for the elections," the party said in a resolution.
An erstwhile ally of the Congress, DMK had snapped ties with that party in March this year over the Sri Lankan Tamils issue. However it managed to drum up Congress' support for Kanimozhi during Rajya Sabha elections which she successfully contested.