Copenhagen advanced through three qualifying rounds to get into the Champions League group stage and gained eight points from their six matches
Copenhagen moved into the last 16 of the Champions League for the first time since 2010-11 as they beat Galatasaray.
Lukas Lerager's side-footed finish from Elias Achouri's cross secured second spot in Group A, with Manchester United coming fourth and being eliminated.
Galatasaray would have qualified with a victory but now drop down into the Europa League play-offs in February.
Copenhagen ended with 10 men as Lerager was sent off for two bookable offences, but Galatasaray could not capitalise.
In the other match in the section, United lost 1-0 at home to group winners Bayern Munich at Old Trafford.
Both Copenhagen and Galatasaray began the day with five points from their opening five matches, to set up a winner-takes-all game.
Peter Ankersen had a glorious chance to fire the hosts ahead inside the opening eight minutes but pulled his strike just wide.
Achouri fired off target early in the second half, before Lerager's vital goal.
Galatasaray's side included ex-Crystal Palace forward Wilfried Zaha and not even the introduction of former Chelsea winger Hakim Ziyech could help them find a goal.
The Turkish side piled on pressure late on but could not equalise, with Cedric Bakambu hitting the side-netting from one of their best chances.
They will now play against one of the Europa League group runners-up in the play-offs in February.
However, it is unclear when Galatasaray will next be in action.
All league football in Turkey has been suspended following an incident in the Super Lig on Monday.
Referee Halil Umut Meler was punched in the face by MKE Ankaragucu president Faruk Koca, who ran on to the pitch after his team conceded a 97th-minute equaliser in a 1-1 draw with Caykur Rizespor.
- Line-upsMatch StatsLive Text
Line-upsFC Copenhagen
Formation 4-3-3
1Grabara22Ankersen3Vavro2Diks19Jelert12Lerager33Falk9Cupido Gonçalves10Elyounoussi7Claesson30Achouri
- 1Grabara22Ankersen3Vavro2Diks19JelertBooked at 37mins12LeragerBooked at 90mins33Falk9Cupido GonçalvesSubstituted forCorneliusat 67'minutes10ElyounoussiSubstituted forHøjlundat 90+3'minutes7Claesson30AchouriSubstituted forBoilesenat 81'minutes
Substitutes
- 6Sørensen8Tanlongo11Larsson14Cornelius18Óskarsson20Boilesen21Sander27Lund39Højlund40Bardghji41Dithmer47Froholdt
Galatasaray
Formation 4-2-3-1
1Muslera93Boey6D Sánchez42Bardakci3Angelino34Torreira23Ayhan20Tetê7Aktürkoglu14Zaha9Icardi
- 1Muslera93Boey6D Sánchez42Bardakci3AngelinoSubstituted forYilmazat 77'minutes34TorreiraSubstituted forOliveiraat 78'minutes23AyhanSubstituted forMertensat 61'minutes20TetêSubstituted forZiyechat 61'minutes7Aktürkoglu14ZahaBooked at 56minsSubstituted forBakambuat 65'minutes9Icardi
Substitutes
- 8Demirbay10Mertens19Güvenç22Ziyech25Nelsson27Oliveira50Yilmaz53Yilmaz88Karatas91Ndombélé94Bakambu
Referee:Daniele OrsatoMatch StatsHome TeamFC CopenhagenAway TeamGalatasarayPossessionHome37%Away63%ShotsHome11Away22Shots on TargetHome3Away7CornersHome3Away9FoulsHome10Away5Live Text Post update
Match ends, FC Copenhagen 1, Galatasaray 0.
90'+5'Full Time
Second Half ends, FC Copenhagen 1, Galatasaray 0.
90'+4'Post update
Attempt saved. Cédric Bakambu (Galatasaray) header from the right side of the box is saved in the centre of the goal. Assisted by Hakim Ziyech with a cross.
90'+4'Post update
Attempt blocked. Sacha Boey (Galatasaray) left footed shot from the right side of the box is blocked. Assisted by Hakim Ziyech.
90'+4'Post update
Attempt blocked. Davinson Sánchez (Galatasaray) header from very close range is blocked.
90'+4'Post update
Attempt blocked. Sérgio Oliveira (Galatasaray) right footed shot from the centre of the box is blocked.
90'+4'Post update
Attempt saved. Mauro Icardi (Galatasaray) right footed shot from outside the box is saved in the bottom left corner.
90'+3'Substitution
Substitution, FC Copenhagen. Oscar Højlund replaces Mohamed Elyounoussi.
90'+3'Post update
Attempt blocked. Kerem Aktürkoglu (Galatasaray) right footed shot from outside the box is blocked.
90'+3'Post update
Attempt blocked. Dries Mertens (Galatasaray) right footed shot from the left side of the box is blocked. Assisted by Cédric Bakambu.
90'+3'Post update
Attempt missed. Cédric Bakambu (Galatasaray) header from the centre of the box misses to the left. Assisted by Sérgio Oliveira with a cross following a corner.
90'+2'Post update
Corner, Galatasaray. Conceded by Kamil Grabara.
90'+2'Post update
Attempt saved. Hakim Ziyech (Galatasaray) left footed shot from outside the box is saved in the top centre of the goal. Assisted by Kerem Aktürkoglu.
90'+1'Post update
Attempt missed. Cédric Bakambu (Galatasaray) header from the centre of the box misses to the left. Assisted by Dries Mertens with a cross.
90'Dismissal
Second yellow card to Lukas Lerager (FC Copenhagen) for a bad foul.
90'Post update
Kerem Aktürkoglu (Galatasaray) wins a free kick in the defensive half.
90'Post update
Foul by Lukas Lerager (FC Copenhagen).
89'Post update
Corner, FC Copenhagen. Conceded by Sacha Boey.
86'Post update
Attempt missed. Cédric Bakambu (Galatasaray) right footed shot from the right side of the box is close, but misses to the right. Assisted by Davinson Sánchez.
85'Booking
Lukas Lerager (FC Copenhagen) is shown the yellow card.
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Source: bbc.com