McDonald Mariga Wanyama was born in 1987 in Nairobi. He was a member of Kamkunji high school, ‘Golden boys’ who won the National championship for two consecutive years, 2002 and 2003. Mariga started his playing career at Ulinzi Stars before moving first to Tusker FC and then to Kenya Pipeline while still at school.The central midfielder went to Sweden in 2005 to play for third Division side Enköpings SK. After only one season at ESK, he signed for Helsingborgs IF before the 2006 season. He moved to the Serie A club Parma initially on loan in August 2007 and later on a four year deal worth 18 million Swedish Kronor, approximately1.94 million euro. Mariga played 35 times for Parma in the Serie B during the 2008 to 2009 season scoring three times to help them back to Serie A for the 2009 to 2010 season. On 1 February 2010, the last day of the transfer window, Mariga moved to Inter in a co-ownership deal. The transfer fee was €5 million in a cash plus player deal which Parma got half the registration rights of Jonathan Biabiany worth €2.5 million and the loan of Luis Antonio Jiménez. On 17 June 2010, Inter bought him outright and bought back Biabiany for €4.2 million each. At the start of the 2011 to 2012 season Mariga was loaned out to La Liga club Real Sociedad. On 4 September 2014, Mariga re-signed with Parma. In January 2016 he was signed by Serie B club Latina. On 31 July 2017, Mariga signed a one-year deal with Spanish Segunda División club Real Oviedo.