Governor K Rosaiah administered the oath of office and secrecy to Udhayakumar in the presence of Chief Minister Jayalalithaa and her cabinet colleagues at a brief function held at Raj Bhavan.
Udhayakumar, who was dropped from the ministry in 2011, stages a comeback following his reinduction into the cabinet.
Udhayakumar, MLA from the Sattur segment, has been given the portfolio of Youth Welfare and Sports Development, hitherto held by K V Ramalingam, who was dropped by Jayalalithaa two days ago in the wake of some land grabbing allegation against him.