FCK were knocked out of the UEFA Cup by Hamburger SV on September 29 after a very controversial refereeing performance by BritishMatthew Messias, giving eight yellow cards, two of those leading to a sending off, and a third direct red card, all in the last ten minutes, and giving HSV a 92nd-minute penalty kick.
In the Superliga they were at the winter break placed first, with only one defeat and four draws after 20 matches. Their biggest win was a 5–1 win against Esbjerg fB at Parken on September 25, where Elrio van Heerden and Marcus Allbäck scored both twice, while the fifth goal was scored by Peter Møller.
At October 26 FCK visited Haderslev Fodboldstadion, where SønderjyskE was the home team. After SønderjyskE opened the match with a Henrik Hansen-goal, Álvaro Santos made it 1–1 with a beautiful scissors kick, which later was awarded as goal of the year. Elrio van Heerden scored to 2–1, Peter Møller to 3–1 and Álvaro made his second goal in the extra time.
The only autumn defeat was against Esbjerg fB on November 5, 2005, where they lost 3–1 at Esbjerg Idrætspark.
On March 12, 2006 they got their second defeat. This time was it the arch rivals Brøndby IF who beat FCK. That match ended 3-0 at Brøndby Stadium.
In the last match on May 14, FCK lost again, this time to Silkeborg IF home at Parken, 2–3 in a very even match. Michael Silberbauer and Brede Hangeland were the goalscorers for F.C. Copenhagen.
In the Cup, FCK started in 5th round, where they met the 2nd Division East team Slagelse BI. After 2–2 at full-time and extra time, the match was decided on penalties. Here, FCK won 4–3, and went through to the quarter finals.
In the quarter-finals, the opponents were the arch rivals Brøndby IF at Brøndby Stadium, where Brøndby won 1-0 after extra time and two red cards to FCK in the second half.
In the 1st round they played against GermanHamburger SV. The first leg was played in the AOL Arena in Hamburg and ended 1–1. Hamburger SV won the second leg in Parken 1–0 to eliminate F.C. Copenhagen and got through to the group stage.
The game would be special for FCK captain Tobias Linderoth, as Hammarby's coach, Anders Linderoth, is his father. In the same matches, both teams were playing in Kappa shirts, and for the draw, the two captains, Tobias Linderoth (Swede, FCK) and Mikkel Jensen (Dane, Hammarby), were dressed in almost identical cardigans. The only difference was the team names.
After a 2–0 victory home at Parken, FCK could spot the semi finals in the horizont, but with two Hammarby goals in the last 5 minutes. Then a penalty shootout should decide their Royal League future, but with 3 FCK goals, and 3 Jesper Christiansen saves, they won the shootout 3–0.
In the semi-finals, FCK drew the other remaining Danish team, FC Midtjylland. Home FCK won 3-1 and away, at SAS Arena, they beat FCM 4–0.
F.C. Copenhagen won in the 2005-06 Royal League season, after an exciting final against Lillestrøm S.K., played at Parken. FCK won 1–0 after an 89th minute Razak Pimpong-goal. Pimpong had substituted Ijeh in the 69th minute, and he got his second yellow card in his enthusiasm after the goal, where he took off his shirt.
Squads
The following squads, are lists with all the players, who have played in F.C. Copenhagen in the 2005–06 season.
First team squad
Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.