Watenga travelled on Monday as previously reported to negotiate a new move as per his agent.
He was officially unveiled on Wednesday morning in Addis Ababa and awarded a two year deal. Watenga will replace goalkeeper Hariston Hessou at the two times Ethiopian champions.
He becomes the fifth goalkeeper to play in Ethiopia after the earlier successful expeditions from Denis Onyango, Posnet Omony, Hannington Kalyesubula and lately Robert Odongkara.
Odongkara has played for seven solid seasons with St George Football Club.