Boomerang Interviú's UEFA Futsal Cup debut in 2002/03 had ended in ignominy as, having beaten MFK Norilsky Nikel 11-3 to earn a final place, they had been found to have used an ineligible player and forfeited the match. The Madrid side made amends the following season.
With entry now up to 33 teams, a preliminary round was needed before main qualifying, and Romania's AS Odorheiu Secuiesc beat England's Tranmere Victoria FC 17-2 on aggregate. The goals continued to fly in during the first qualifying round; holders Playas de Castellón FS struck 24 in their three wins, Interviú topped that with 38 and the beaten finalists in the previous competitions, Action 21 Charleroi, totalled 61 including a 44-3 victory against FC Olimpic Tirana, ten of them scored by André Vanderlei.
Castellón and Charleroi both had to travel for their second qualifying group, and neither was to make it three finals out of three competitions after last-day showdowns with their mini-tournament hosts. There was not far for Castellón to travel as Interviú staged Group A, and the holders began well by beating Dutch side ZVV West Stars 17-0 while Interviú edged past FC interKrAZ Kyiv 5-4. The Ukrainian side trailed by that scoreline against Playas in their next game but Georgiy Melnikov secured a last-gasp 5-5 draw while Interviú went top with a 10-0 defeat of West Stars. Now they only needed a draw with Castellón and although Boomerang trailed 2-1 at the break, Javi Rodríguez scored a last-minute equaliser to eliminate his former club and end their monopoly of the title.
Charleroi started Group B strongly with a 6-0 win against MNK Split while hosts SL Benfica overcame Prato C/5 5-2. A 5-1 win against Prato was a mixed blessing for Charleroi, and Benfica struck seven times in the first 15 minutes against Split as their 7-0 victory took them top on goals scored. Benfica only now needed to draw with Charleroi and raced into a three-goal lead, which was cancelled out only for the home side to score twice more and prevail 5-4.
A new name would now be on the trophy and, at home first, Interviú got off to a good start as Marquinho struck on two minutes and Daniel quickly added two more goals. Andreu scored on 34 minutes but a late Arnaldo goal gave Benfica hope for the return. Daniel, however, took just two minutes to score in Lisbon and although Rogério levelled on the day, Marquinho made it 2-1 at the break. Benfica now needed five goals to take the lead in the tie and André Lima made it look possible when he struck on 25 minutes and twice more in the 33rd minute. But seconds later Daniel found the target and Interviú kept the trophy in Spain 7-5 on aggregate.
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