Barcelona coach Pep Guardiola is wary of the threat posed by Milan in the return leg of the Champions League quarter-final. MILAN - Barcelona coach Pep Guardiola has held his pre-game press conference. He said: \"Milan did not have an easy game at Catania against Vincenzo Montella\'s side. Controversies such as those of the two goals against Juventus and Catania are part of football. Although we did not have a penalty in the first leg against Milan at that San Siro teams that want to get the semi-finals of the Champions must overcome all these things. Excuses do not matter. In any case the teams that can play better in the quarter-finals and semi-finals are the Italians cup. They have patience, they do not rush and they can hit you. Milan have the tranquility of the goalless draw from Milan. \"I have a feeling that tomorrow Milan will score a goal, so for us to go through we will have to score at least two goals and we have to attack as best as possible their defense. Xavi\'s got some fitness problems, but I am optimistic and I think the problem will not prevent him from playing. He will definitely play if he is fit but if not then someone else will take his place. It will be a tough game. Milan are strong at the back and their counter-attack is a concern with Ibra and Boateng. We have to play at a high tempo, with intensity and to the best of our abilities.\" Barcelona captain Carles Puyol had this to say ahead of the match against Milan: \"We’ll take this game on like any other game: we’ll go out to win and try to play our game. We’re aware that we’re going up against a fantastic team, but I’m sure they’ll come out to defend and capitalise on counterattacks. We’ll have to put in a complete game both defensively and offensively.\"