Porto and Sporting CP played out a 2-2 draw at the Estadio do Dragao on Friday, but wild scenes at the end saw four players shown red cards.
Sergio Conceicao's Porto had come from 2-0 down to level the match and then went close to a 96th-minute winner when a corner almost fell to Pepe to score.
An overhead kick clearance saved the visitors, however, and Pepe went down holding his face.
Sporting's players felt the former Real Madrid man was trying to buy a penalty, despite the final whistle having been blown, and soon numerous players and staff from both teams were squaring up on the pitch, with stewards and the officials attempting to restore calm.
Amid the melee, referee Joao Pinheiro sent off Pepe and Porto team-mate Agustin Marchesín, as well as Sporting duo Joao Palhinha and Bruno Tabata.
Sporting had already seen Sebastian Coates sent off early in the second half for two yellow cards.
After an early Paulinho header, a lovely team move ended with Nuno Santos making it 2-0 after 34 minutes as Sporting played from back to front, Pablo Sarabia eventually squaring for Santos to double Sporting's lead.
Ruben Amorim's side were eager for a win to close the gap in the Primeira Liga title race, but Fabio Vieira pulled a goal back just four minutes after Santos's strike, before a Mehdi Taremi header with 12 minutes remaining levelled things.
Following the late drama, Porto stay six points clear of Sporting at the top of the table and moved 13 ahead of third-placed Benfica, who have played a game fewer than their two rivals.
Kane believes Bayern can improve further after nine-goal Zagreb rout
Harry Kane insisted Bayern Munich have further room for improvement after scoring four goals in their record-breaking 9-2 Champions League rout of Dinamo Zagreb.
Kane netted four times – including three from the penalty spot – as records tumbled in the Bavarian giants' first European outing under new boss Vincent Kompany.
Tuesday's four-goal haul took Kane to 33 Champions League goals, surpassing Wayne Rooney (30) as the top-scoring Englishman in the history of the competition.
It was the 24th hat-trick of Kane's professional career for club and country, while he became the first player to ever score three penalties in a single European Cup/Champions League game.
Bayern, meanwhile, are the first team to ever score nine times in a Champions League match, with Real Madrid being the last side to do so in the old European Cup in 1990 (9-1 versus Wacker Innsbruck).
Kane, however, told DAZN there are areas in which Bayern must improve, having been joined on the scoresheet by Michael Olise (twice), Leroy Sane and Leon Goretzka.
"It was an amazing game. The first half was really good, we took our chances," the England captain said.
"We didn't start the second half well and got caught from a couple of second balls. We'll have to learn from that.
"Today we got away with that bad start in the second half, but against top opposition we could get punished for that.
"But the reaction afterwards was really good. It's great to score all these goals."
The only blot on Bayern's victory – which took them to the top of the Champions League's new 36-team league table – came as Manuel Neuer was substituted at half-time.
The goalkeeper had earlier appeared to be in discomfort after colliding with Zagreb striker Bruno Petkovic, but he played down concerns over his condition after the match.
Speaking to reporters in the mixed zone, Neuer said: "I collied there and I was a bit gone.
"Then I hit a few balls and the pain stabbed me in the thigh. But it's nothing serious, a small matter."
Inzaghi focused on revamped Champions League, not 2023 final 'rematch' with Man City
Simone Inzaghi is not treating Inter's Champions League opener at Manchester City on Wednesday as a rematch of last year's final.
The Scudetto winners were beaten 1-0 by Pep Guardiola's side in the 2023 final, as Rodri's finish in Istanbul proved the difference.
Inzaghi is adamant that changes to the Champions League format and the fact that there is much less riding on the result make it very different to their previous encounter.
"Tomorrow starts a new Champions League, that will be very different," the Inter head coach told a press conference on Tuesday.
"I re-watched [the final] a month ago when we were in training camp. I don't think it's a rematch because it's not a final, it's a group game in the new Champions League format."
Inzaghi was enthusiastic about the changes to the format, with clubs playing eight matches in a 36-team league phase instead of the previous group stage.
But he said he was also aware of the burden on players from the amount of games they will now play after Man City midfielder Rodri said players were on the verge of going on strike.
"We know that you play a lot and we coaches are aware of that. I can say that preparing these games for a coach is beautiful and exciting," Inzaghi added.
"I know there are problems, but we are counting on getting through. I will have to alternate as many players as possible, we are without [Federico] Dimarco and [Marko] Arnautovic, but we have been used to having a sometimes limited rotation for two years now."
Inzaghi added that he was pushing his team to be aggressive and determined despite City having not lost at home in the competition since 2018.
"We will need a lot of components to make a great match," he concluded.
AC Milan 1-3 Liverpool: Reds recover from early scare for winning start
Liverpool celebrated their return to the Champions League with a 3-1 victory over AC Milan at San Siro on Tuesday, overcoming a shaky start for a comfortable triumph.
The Reds got off to an awful start when Christian Pulisic finished Milan's deadly counter-attack in the third minute, aided by Liverpool's disorganised defending on their return to the competition after a year's absence.
Arne Slot's side turned things around, however, as Ibrahima Konate equalised in the 23rd minute when he leapt high above a crowd of defenders to head in Trent Alexander-Arnold's free kick.
Virgil van Dijk put Liverpool ahead after nodding home Kostas Tsimikas' corner prior to the break before Dominik Szoboszlai sealed victory in the 67th minute, slotting into the far corner from Cody Gakpo's cross after Milan gave up possession.
Slot's first Champions League game at the helm of Liverpool ended in deserved victory, and it was a terrific response from his team after their shock 1-0 loss to Nottingham Forest in the Premier League on Saturday.
Data Debrief: Defensive delight for Reds
With Konate and Van Dijk both on target, Liverpool had two defenders score in the same Champions League game for the first time.
It marked a fitting way for Van Dijk to celebrate a landmark appearance, becoming just the third Dutch player to score on his 50th outing in the competition, after Ruud van Nistelrooy and Roy Makaay (both in 2005).
Alexander-Arnold's assist for Liverpool's equaliser was also his 80th for the Reds. Since his debut in October 2016, only Kevin De Bruyne (146) and team-mate Mohamed Salah (90) have provided more in all competitions among Premier League players.
Those defensive performances at the other end of the pitch helped Liverpool to a fifth win in their last six away games against Italian sides in all competitions (L1), having won just three of their first 14 such visits (D3 L8).
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