In a statement, football's world governing body Fifa said it's Disciplinary Committee had " taken a decision to sanction the Cape Verdean Football Association (FCF) for fielding an ineligible player" and that the "match has been declared to be forfeited".
Fifa ruled that Fernando Verela should not have played in his side's 2-0 win as he had not completed a suspension.
Tunisia will be submitted into the draw for the final qualifying round on 16 September after being awarded a 3-0 victory.
Fifa said Verela "failed to serve a four-match suspension imposed on him after receiving a red card for unsporting conduct towards a match official during a World Cup qualifier on 24 March".
Cape Verde Football Association has also been fined $6,400.
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