Career
He joined Parma after the end of the season. In 2009 he was loaned to G.D. Tourizense, but returned to Kenya 2 years later when he joined Sofapaka, before returning to his former club Mathare United in 2012. He finished the 2012 Kenyan Premier League season with 9 goals for his club, making him the joint 9th top scorer.
On 12 December 2012, Ouma signed for Sony Sugar for an undisclosed fee, along with his former Mathare United team-mate John Kio.