Indian Premier Leauge franchise Mumbai Indians have retained captain Harbhajan Singh in the team.According to IPL sources, Harbhajan's name does not figure in the list of cricketers who will be dropped by the Mumbai Indians. Mumbai Indians, probably the biggest under-achievers of the five-year-old IPL, are now seriously looking at revamping their team for the sixth edition. It is understood that the team management has released at least six players from the roster, a mix of Indian and foreign players.