Murthy's five-year tenure begins from June 1, 2013 and he called his return as the start of the second innings.
The reshuffle also saw Murthy's son Rohan Murthy being appointed as his Executive Assistant.
Murthy, who had earlier denied any possibility of passing the company's baton to his son, said the only role that Rohan has is to make him effective and he will have no leadership role.
Vaclav Klaus (C), President of the Czech Republic, plays billiards as his wife Livia Klausova (L) and Narayana Murthy (R, white shirt), chief mentor of Infosys Technologies Ltd, watch during his visit to the Infosys campus in Bangalore November 10, 2005.
In a bid to bring the IT company back on the high growth path, NR Narayana Murthy returned back as Executive Chairman and Additional Director on the Infosys Board on Saturday.
Russian President Vladimir Putin (L) shakes hands with N R Narayana Murthy (R) chairman of Infosys Technologies during his visit to the corporate headquarters of Infosys in the southern Indian city of Bangalore December 5, 2004.
Chairman and Chief Mentor Officer NR Narayana Murthy (R) and Chief Executive Officer, President and Managing Director Nandan M Nilekani of Infosys Technologies Ltd, attend a news conference in Bangalore, April 14, 2006.
KV Kamath, Board Chairman, has stepped down from his position and taken up the position of Lead Independent Director effective from June 1, 2013.
Chairman and Chief Mentor Officer of Infosys Technologies Ltd, NR Narayana Murthy speaks during a news conference in the southern Indian city of Bangalore April 14, 2006.
India's second-largest software exporter reported a 21 per cent jump in quarterly profit on Friday and forecast better earnings ahead on an outsourcing boom.
Murthy started Infosys in 1981 and served as its CEO from 1981 to 2002.