The 2003 UEFA Cup Final was played on 21 May 2003 between Celtic of Scotland and Porto of Portugal. Porto won the match 3–2 in extra time thanks to a goal from Derlei. This was also the first game to use the silver goal rule, although it did not affect the outcome of the game as Porto scored in the second half of extra-time, thus meaning the game had to be played until the end of extra-time.
Prior to this game, no club in Scotland and Portugal had ever won the UEFA Cup.
The game had what UEFA described at the time as "the largest travelling support to have assembled for a single game" – around 80,000 Celtic fans travelled to Seville for the final. For this turnout and the manner with which they conducted themselves, Celtic fans received an award from FIFA and UEFA, winning the FIFA Fair Play Award that year and being presented with a formal recognition from UEFA at a home match the following season.
A rash challenge led to Joos Valgaeren of Celtic getting a yellow card in the eighth minute. After this it was a stoic affair, until 32 minutes into the first half when Nuno Capucho played in Deco, but he could do no more than fire his shot straight at Robert Douglas. Straight after this attack, Celtic broke on the counter with Henrik Larsson putting Didier Agathe through on the right but his cross was too high for Chris Sutton. Larsson had a chance to make it 1–0 in the 35th minute but was unable to get enough contact on the ball. Porto came close in the 41st minute when Deco moved past Bobo Baldé to go one on one with Douglas, who saved Deco's shot with his legs.
Porto found a way through on the stroke of half-time. After some great work from Deco, Dmitri Alenichev's shot was parried by Douglas and Derlei slotted the ball in to give Porto a 1–0 lead. It was his 11th goal of the competition. Porto's lead did not last long after the restart as Celtic equalised after 47 minutes when Larsson met Agathe's cross to direct a looping header in over the helpless Vítor Baía to get his tenth goal of the tournament and his 200th Celtic goal. However, within five minutes, it was 2–1 when Deco evaded a tackle and slipped a through ball to Alenichev who converted the cross.
Three minutes later, Celtic levelled once again Larsson took advantage of poor marking when he powerfully headed in Alan Thompson's corner. With Deco remaining a consistent threat, Martin O'Neill brought on Jackie McNamara in 76 minutes to nullify Deco's threat. In the 80th minute Bobo Balde picked up a yellow card. A couple of minutes from time McNamara's errant pass found Alenichev, but he could not find the target and shot over. Jose Mourhino was heavily criticised for time wasting, every time the ball would go out of play the Porto manager would instruct the ball boys to remain seated or to take their time finding a ball, thus constantly running down the clock. A move which would serve to taint the managers reputation for cheating.
Normal time ended with the game at 2–2. Celtic were down to ten men in the 96th minute when Baldé was dismissed after collecting his second yellow card. O'Neill reconfigured his team by moving McNamara back to fill the gap in defence caused by Balde's dismissal.
Celtic could not hold out for penalties, as Derlei reacted quickest to a Douglas block in the 115th minute and rounded McNamara to make it 3–2, a silver goal which won the game. Porto had Nuno Valente sent off in the last minute but no further goals meant that they had ended their 16-year wait for a further European trophy.