He was responding to queries by journalists on the reported remarks made by Viduthalai Chiruthaigal Katchi (VCK) chief Thol Thirumavalavan about DMK leading a front of parties including DMDK.
VCK is DMK's ally.
"That is indicative of his (Thirumalavan) good intentions. I will be happy if there is such an opportunity," Karunanidhi said.
DMDK had been an ally of Jayalalithaa-led AIADMK during the 2011 assembly elections in Tamil Nadu but had parted ways later.