Porto win at Benfica to seal Portuguese title

The result also guarantees that last year's champions Sporting will finish second, and qualify for the Champions League group stage, with Benfica third.

Nigerian left-back Zaidu struck on a counter-attack minutes into stoppage time to put Porto nine points ahead with one round of games to play.

Sporting travel to Portimonense later Saturday and have an eight-point edge and a game in hand on Lisbon rivals Benfica.

Benfica, who reached the quarter-finals of the Champions League this season, will go into the qualifying round of the competition. Before their first league defeat this season, at Braga two weeks ago, Porto, under coach Sergio Conceicao, set a new Portuguese league unbeaten record of 58 games.