Bandari FC have qualified for the final round of the Caf Confederation Cup preliminaries despite falling 2-1 away from home against Ben Guardane of Tunisia on Sunday.
After winning the first leg in Nairobi 2-0, the Bernard Mwalala-led Dockers needed a draw of any kind or a loss by a lesser margin to advance.
The East African side was shocked by their hosts after just four minutes. Michael Wanyika made only an attempted save from Dos Santos' effort but the ball fell loose toward Alves Perreira who banged the opener home.
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Perreira completed his brace in the 20th minute, this time around finishing a well-executed counter-attack which caught the visitors napping.