Taremi pounced on a sloppy back pass once sixty-three seconds to fireside within the opener that left Juventus flustered as they didn't produce any important possibilities before the pause.
Things got worse for Andrea Pirlo's facet once Marega blasted in Porto's second nineteen seconds into the last half.
Juventus eventually mustered a response once Chiesa pink-slipped home a precious away goal with eight minutes remaining, however, it absolutely was not enough to prevent the 2004 champions from celebrating their 1st finish over the Italian club at the sixth try.
The winger's strike concluded Porto's run of 5 consecutive clean sheets within the competition and leaves the tie wide open prior to the come leg.
Juventus affected within the cluster stage by winning 5 games from six, together with a 3-0 final day finish at the port.
But they got off to the worst beginning potential once Taremi anticipated Rodrigo Bentancur's pass back to Wojciech Szczesny and fell in to shoot past the goalkeeper from shut vary.
Juventus were visibly knocked off their stride by the aggression of Porto's pressing and were virtually caught out once more once Szczesny cleared the ball straight to Sergio Oliveira, whose shot was deflected wide.
Matters were created worse for the Turin club once captain Giorgio Chiellini limped off with injury once thirty-four minutes.
Porto were even faster out of the blocks within the last half as Marega got on the tip of a Wilson Manafa cut-back to fireside home among seconds of the restart.
Szczesny stuck out a hand to prevent Associate in Nursing Oliveira shot from creating it 3, however, the guests finally came to life within the final twenty minutes.
Agustin Marchesin had to scramble to palm away a deflected Chiesa shot before the European country international raced onto a pass to cushion an end into the corner.
The goal created Chiesa the primary Juventus player apart from Cristiano Ronaldo to attain a knockout stage goal within the Champions League since Blaise Matuidi in April 2018.
Ronaldo, the competition's incomparable high scorer, was, for the most part, unbroken quiet on his come to his home country, however, he had appeals for a penalty waved away in stoppage time once happening below a challenge.
Pirlo was left pissed off that his side gifted Porto an early lead and aforementioned it at once modified the tempo of his side.
"We ready for the sport well, otherwise from, however, it absolutely was throughout the match," Pirlo told Sky Sports Italy.
"That wasn't the perspective that we have a tendency to needed to impose, however, once you go down a goal once a moment it gets tougher.
"We knew that they finish off the areas okay, it absolutely was the match that they needed to play and that we handed it to them on a silver platter."
Porto coach Sergio Conceicao aforementioned his facet won't send his team to European country merely to carry onto their slender advantage within the second leg.
"We have to be compelled to be rigorous defensively, it will be a distinct game," Conceicao aforementioned.
"Juve has to be compelled to perform a comeback, however that does not mean we are going to go there simply to defend. We'll see who can play if the characteristics of the players are totally different."
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