Chelsea survived a spectacular late overhead kick from Mehdi Taremi to displace Porto and confirm a place in the Champions League semi-finals for the first time in seven years.
Thomas Tuchel's side went into this 'home' last-eight second leg - with both games being played in Seville during the current Covid-19 pandemic - protecting a two-goal lead they only briefly threatened to surrender in the dying seconds following Taremi's brilliant finish.
Chelsea, who will now face either Liverpool or Real Madrid in the semi-final, were able to keep a disappointing Porto at bay, the Portuguese side rarely testing keeper Edouard Mendy with their surprisingly cautious approach, which they only shoved aside 'a little too late'.
Mendy's poor clearance almost offered Jesus Corona a first-half chance but he could not take advantage, while Christian Pulisic and Mason Mount had squandered opportunities after the break.
Taremi's goal was out of character with the rest of Porto's performance and came too late to alter the inevitable course of this quarter-final.
Chelsea's hopes of claiming the crown for a second time will certainly be rising after this mature performance, even in eventual defeat, to add to the impressive elimination of the powerful La Liga leaders Atletico Madrid in the last 16.
Chelsea have reached the Champions League semi-finals for the eighth time, more than any other English side in the competition's history.
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