Vijayan, was being "relieved" as District Secretary of Nagapattinam South, DMK General Secretary K Anbazhagan announced in a statement.
He was being replaced with N Gauthaman.
Further, the District Secretaries of Nagapattinam North and Tuticorin North, P Kalyanam and K Rajaram, respectively, were also being relieved, Anbazhagan said.
They were being replaced by Niveda M Murugan and A Subramanian, respectively.
Anbazhagan reasoned that the changes were being made to ensure the party affairs were "prompt" in the respective units and urged the local functionaries to extend their cooperation to the new office-bearers.
The party had earlier made a similar rejig, changing some district secretaries.