uefa.com gauges the reaction from the clubs involved in Thursday's draws for the fourth round.
Celtic FC v FC Barcelona
Barcelona are giants, but if you look at the quality of the sides at this stage of the competition, there are no easy matches. We are playing the first match at home and are looking forward to hosting it. We are certainly looking to do our best in this competition, wherever it takes us.
Ronnie Hawthorn, Celtic head of operations
We all know about Scottish football and how physical it is. Celtic are not weak rivals but right now we are going through a good moment and feel comfortable whichever rival we have to face. The cold weather could make things harder for us, but we have just played in Denmark and it was quite cold there.
Ronaldinho, Barcelona player
Gençlerbirligi SK v Valencia CF
We are looking forward to the matches already. Valencia are one of the strongest sides in this season's UEFA Cup. We will do our best. Earlier in the season Valencia played against Besiktas [JK], so we have some knowledge of them.
Suphi Yalcinkaya, Genclerbirligi vice-general secretary
We will face another Turkish team, having just come back from Istanbul [and Besiktas]. Until now our meetings with Turkish clubs have been difficult but positive. We are optimistic and hope to progress to the next round. At this level of competition every team is strong.
Francisco Real Alacreu, Valencia director
FC Girondins de Bordeaux v Club Brugge KV
We have been drawn against a neighbour and a team we know well. It will be a very open game. We hope to go through to the quarter-finals.
Charles Camporro, Bordeaux sports director
Bordeaux are in the middle of their league but they are still a French team. Ligue 1 stands for technical, physical and well-organised football. So winning will be difficult. I would not say I am relieved with the draw, because it will be tough. But we are hopeful of reaching the quarter-final.
Brugge technical manager Marc Degryse
Newcastle United FC v RCD Mallorca
We have reached a stage where every game is difficult. Everyone at the club was disappointed about the lack of success in the UEFA Champions League this season, but the UEFA Cup has been great compensation.
Russell Cushing, Newcastle chief operating officer
We have been drawn against a strong team. Newcastle have a proud history and a number of great players, and it's going to be a difficult match. Our only advantage is that we are away first. But Mallorca is a popular island with the English, and it's possible there will be more British supporters than locals at the return leg.
Joan Frontera Mayol, Mallorca director of communications
AJ Auxerre v PSV Eindhoven
It's going to be very difficult. PSV are a good side, they were eliminated from the UEFA Champions League, they know us, and we know what awaits us. We cannot anticipate a quarter-final yet.
Guy Sénéchal, Auxerre director
Auxerre is a difficult tie but we have experience of playing them in 2002. We are hoping for a repeat of that in terms of organisation and atmosphere, but not the result.
Peter Westelaken, PSV manager of match organisation
SL Benfica v FC Internazionale FC
Playing against Internazionale will be very difficult. But I think it's a 50-50 chance for both clubs to go through. We have met each other in the past so many times. We have a grand new stadium awaiting [UEFA] EURO 2004™ and one of our roles is to promote the game of football.
António Simões, Benfica sports director
We are facing a glorious side, a club who are part of football history. It's a fascinating tie. Their coach is José Antonio Camacho and we know his teams have great fighting spirit.
Alberto Zaccheroni, Inter coach
Liverpool FC v Olympique de Marseille
We played one of our best matches in Europe last night against [PFC] Levski Sofia. It was a big European night. We have never played Marseille before, but our coach [Gérard Houllier] knows a bit about them. When you come to this stage of the UEFA Cup, the tantalising games come up. And people who put it [the UEFA Cup] down are doing it an injustice.
Rick Parry, Liverpool chief executive
We had a vote this morning to decide who we would most like to face in the next round - Liverpool won with 90 per cent. It's a pleasure for me to play at Anfield. However, the best thing will be having Liverpool at the Vélodrome - it will be party time for our fans. Liverpool have a great attack with [Emile] Heskey, [Harry] Kewell and, of course, [Michael] Owen but we have not lost for six matches and it will be a genuine test of both teams.
José Anigo, Marseille coach
Villarreal CF v AS Roma
Roma are a European giant, with impressive players and an impressive coach. It will be a pleasure to welcome them. I think it's the most significant moment in the history of our club.
José M Llaneza Durá, Villarreal official
Villarreal are exactly the opponents I wanted to avoid of the four teams we could have faced. It will be an extremely difficult game even if we play to the best of our ability. However, I believe that if we play at that level we are capable of beating anyone.
Fabio Capello, Roma coach