"I bear Dhanapala nothing but goodwill and I wish him well in whatever he undertakes," Tharoor said.
"The fact that they (Indians) waited until quite late in the process to announce Tharoor's candidature was unfortunate, and it was certainly seen as a spoiler to my own candidature," he told Lanka Monthly Digest in an interview.
The confirmed death toll from the deadliest quake in the region in two decades stood at more than 24,000 across southern Turkey and northwest Syria four days after it hit.
Unidentified snipers shot Kadirgamar in the head and heart late Friday at his home in the capital Colombo. No one has claimed responsibility for the assassination, but Kumaratunga and military officials have roundly blamed Tamil Tiger rebels.
Sri Lanka on Friday announced withdrawal of its nominee Jayantha Dhanapala from the race for the post of next United Nations Secretary-General following his consistent bad performance in the last three straw polls.