ChampionsLeague progression will mean they now have midweek games ahead of their league matches against Aston Villa and Wolves next month. These weeks will be an even bigger challenge for Arsenal in regards to how Arteta chooses to use his squad.
Gabriel Jesus and Oleksandr Zinchenko were both given an opportunity to take further steps back in their returns from injury tonight, which should bode well for the coming weeks. They also have Thomas Partey and Takehiro Tomiyasu, who will now have the two-week international break to regain more fitness.
The Arsenal captain has been in great playmaking form since December and has created more chances from open play (62) than any player in the top five European leagues. But that sumptuous final ball was not the only eye-catching moment supplied by the 25-year-old Norwegian.
In the first leg, Havertz was the only member of the Arsenal XI to have previously started a knockout game in the Champions League. In the return at the Emirates Stadium, Jorginho added his calming presence, but the collective inexperience was still evident.
William Saliba and Saka have arguably been their most consistent players this season, but both struggled to truly settle. Whether it be loose touches in possession or a nervousness to bring down aerial balls, this was a different game to everything they are used to.
That was the only time Arsenal were able to force the ball past Diogo Costa across two games, plus extra time, before the shootout. Arsenal did not perform to their maximum, but Porto more than played their part in frustrating them across both legs.
Trossard also spoke to UEFA.com about his goal: "I gave it to Martin (Odegaard) and I know when he's on the ball, you have to get in behind, because he will find you. In that moment, I saw him looking at me and I knew he would find me. Then I just tried to put it in the corner. I was so pleased it gave us the lead.
"You learn from every game. We learned from the first leg and today we played really well. We didn't give a lot of chances away and managed to score. You have to dig deep to win these games and that's what we did."
Leandro Trossard, whose goal levelled the tie for Arsenal, spoke to UEFA.com after the match: "It was nerve-wracking, of course. We have so many good penalty takers, so obviously I believed in them, but in the end it's a lottery. The saves from David (Raya) were incredible, so that's how you win games. We're really pleased to go through after such a long time. It must be amazing for the fans.
The final two quarter-finalists will be confirmed tomorrow. Atletico Madrid host Inter Milan with the Italian team holding a slender 1-0 advantage from the first leg, while Borussia Dortmund and PSV face off in Germany after a 1-1 draw in the first leg.
? "Even though we hate the way, Porto really made us suffer in both ties. Great plan, really well coached, tactically made us play the way they wanted and those fast wingers with great dribbling hurt us.
Porto defender Jorge Snchez also spoke to DAZN after the match: "It's a difficult feeling to explain. We're sad for the result, happy for the display and what we've achieved. We played eye-to-eye with Arsenal, who are a great team.
"We never played with penalties in mind, but now we have to look ahead because there's still a lot to achieve. The coach asked me to give everything and that's what I did, but in the end we didn't get through."
Porto coach Srgio Conceio spoke to DAZN after his club's elimination: "I am proud. We were superior in both games. We had one or two chances in extra time against a team that scores a lot of goals, the Premier League leaders. We worked hard but set up a little poorly. Otherwise, we would have gone through.
"We knew the pressure Arsenal were going to put on us. Arsenal always come on very strong and we were prepared for that. At this level, a mistake is costly. The players are to be congratulated, they gave everything. It was the details. We were better in both games and deserved to go through."
? "You are very nervous. You are hoping for the best, but you know it's a bit of a lottery. We had our preparation yesterday and the day before, just in case, and it really helped. So credit to the goalkeeping coaches and everybody that contributed.
"It's really difficult to play against Porto. They are a really competitive team. You don't get many moments when you can control the game because it's stop-start, direct play, battle after battle and they are a really good side.
Pepe, who put in a massive performance at the age of 41 for Porto tonight, spoke to DAZN after the match: "It's a shame to be eliminated like that, but that's part of football. We were a team that gave Arsenal a hard time, starting with our home game. Today, they got the goal with their first shot on target.
"We didn't forget that Arsenal are a great team who score a lot of goals in league games. We came to play our game, neutralising Odegaard's play between the lines. We knew what we were doing but unfortunately we couldn't score. They were lucky."
Everything old is new again. This is how it once was in the National Hockey League up until 1956. Players will be required to sit for the full two minutes, with teams getting the full time with the man advantage, regardless of how many goals are scored. This is how major penalties are currently handled. Obviously, this puts a greater significance on each penalty, as power plays are more valuable both in terms of potential goals scored as well as eating up the full two minutes on the clock.
Teams in each group will play each other, with the top 16 teams advancing to the playoffs based on the overall rankings at the conclusion of the regular season. The championship game is slated for February 20.
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