In 1991, he directed the film Namma Ooru Mariamma starring Nizhalgal Ravi and Sarathkumar, before working as a writer on Thangamana Thangachi (1991) for director Senthilnathan.
[3] In June 2005, director Rajan chose to shelve his proposed biopic of Sivakasi Jayalakshmi titled Niram Maraiya Rojakal starring Vindya.
He then began working on a directorial project titled Unarchigal which would explore the life of adolescent youths and cast actresses Devayani and Sindhuri in the lead roles, alongside newcomer male actors.
[10][11] During a public speech in December 2019, he criticised actors Kamal Haasan and Dhanush, and directors Selvaraghavan and Gautham Vasudev Menon, for their loss-making films.
[13][14] In 2019 and 2020, he has also publicly criticised Yogi Babu at the audio launch of Paramapadham Vilayattu (2021), Bharathirajaa for starting a rival producers' association, and the Animal Welfare Board of India for allegedly taking bribes.