Barcelona v Celtic: Tito Vilanova worried about aerial threat to makeshift defence We would like to improve on everything and score more and concede less and we will try to do that. But all Champions League games are complicated and I am worried because Celtic are very fast up front and they proved it against Spartak. They play good, counter-attacking football so we know they are dangerous. They are also good in the air and so I am really worried about that. Celtic tied with Benfica and beat Spartak in Moscow which was a good thing for them. At the beginning people maybe did not take into account of the possibility of Celtic going through but with four points from two games and two games at home to go, they have a chance. Pedro was also grilled about Barca's defensive situation but the Spain forward insists Vilanova has the squad to cope. He said: "It is clear we have injuries but Tito is doing very well, adjusting players in defence and getting good performances. It is logical that it might affect us but we have to get used to it. It is lucky for us that we have a great squad but obviously if we have a fixed defence then it is better for us. It is a very important game for us in terms of us wanting to qualify. Celtic will wait for us and try to get us on the break but if we win it puts us in a great situation. Celtic striker Miku, meanwhile, believes the Hoops can pull off what would be a shock win over Barcelona in the Nou Camp. Asked whether Celtic could upset the odds, on-loan Getafe striker Miku, 27, replied "absolutely" before claiming the Hoops" winning mentality can help. He said: "Celtic is a team who have to win our games in the Scottish Premier League. When we don't it is terrible, I felt that the first day I came here. We will go into this game with the same mentality - to win, win, win. We have a very good manager and he always speaks about the mentality. We will go on to that pitch tomorrow with the same feeling. It will be a difficult game but we want to win. They have a couple of injuries and that might give us a chance to do something. The Venezuela striker, who joined the Parkhead club in the summer, looks forward to coming up against old foe Lionel Messi. He said: "In the past I have played against Barcelona and I have felt everything because I have won, I have lost and I have drawn. They are difficult games and I think they are the best team in the world just now and [in Messi] have the best player in the world just now. He is their best player of their history. I played against him when he played for Barcelona B, and after I played against him in the South America Under-20s, I have played against him for Getafe and now I play against him when he plays for the Argentina team. He is so quick and he is always thinking about the goal, but it is possible to stop him. When you think of Barcelona it is not only Messi, if he does not have a good day they still have a lot of good players so tomorrow we have to be careful of everybody. µ Benfica, coming off a draw at Celtic and a home loss to Barcelona, travelled to Moscow without midfield trio Pablo Aimar, Nolito and Carlos Martins, who are all injured. Their absence has made room for midfielder Nico Gaitan's return. Spartak are without first-choice goalkeeper Andriy Dykan while backup Sergei Pesyakov is doubtful because of a foot injury sustained in Saturday's loss to Anzi Makhachkala.