2003–04 UEFA Champions League knockout stage


The knockout stage of the 2003–04 UEFA Champions League ran from 24 February 2004 until the final at the Arena AufSchalke in Gelsenkirchen, Germany on 26 May 2004. The knockout stage involved the eight teams who finished in the top two in each of their groups in the group stage.
Each tie in the knockout stage, apart from the final, was played over two legs, with each team playing one leg at home. The team that has the higher aggregate score over the two legs will progress to the next round. In the event that aggregate scores finish level, the team that scored more goals away from home over the two legs will progress. If away goals are also equal, 30 minutes of extra time are played. If there are goals scored during extra time and the aggregate score is still level, the visiting team qualifies by virtue of more away goals scored. If no goals are scored during extra time, there will be a penalty shoot-out after extra time.
In the draw for the round of 16, matches are played between the winner of one group and the runner-up of a different group.
In the final, the tie is played over just one leg at a neutral venue. If scores are level at the end of normal time in the final, extra time is played, followed by penalties if scores remain tied.
Times are CET/CEST, as listed by UEFA.

Qualified teams

GroupWinnersRunners-up
A Lyon Bayern Munich
B Arsenal Lokomotiv Moscow
C Monaco Deportivo La Coruña
D Juventus Real Sociedad
E Manchester United Stuttgart
F Real Madrid Porto
G Chelsea Sparta Prague
H Milan Celta Vigo

Bracket

Round of 16

First leg

----
----
----
----
----
----
----

Second leg

Chelsea won 1–0 on aggregate.
----
Deportivo La Coruña won 2–0 on aggregate.
----
Lyon won 2–0 on aggregate.
----
Porto won 3–2 on aggregate.
----
Arsenal won 5–2 on aggregate.
----
Milan won 4–1 on aggregate.
----
AS Monaco 2–2 Lokomotiv Moscow on aggregate. AS Monaco won on away goals rule.
----
Real Madrid won 2–1 on aggregate.

Quarter-finals

First leg

----
----
----

Second leg

AS Monaco 5–5 Real Madrid on aggregate. AS Monaco won on away goals rule.
----
Chelsea won 3–2 on aggregate.
----
Deportivo won 5–4 on aggregate.
----
Porto won 4–2 on aggregate.

Semi-finals

First leg

----

Second leg

Porto won 1–0 on aggregate.
----
Monaco won 5–3 on aggregate.

Final

As winners of the competition, Porto went on to represent Europe at the 2004 Intercontinental Cup.