Thambidurai later told reporters that it was a courtesy call as he has known Rao for a long time.
He said he did not discuss the political situation in the state with Rao.
Tamil Nadu Finance and Fisheries Minister D. Jayakumar also met Rao. Jayakumar said: "The meeting was in connection with the selection of Vice Chancellor of a university."
The meetings come amid efforts within the divided ruling AIADMK to merge.
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