Barcelona coach Tito Vilanova admits he is concerned about how his makeshift defence will cope against Celtic on Tuesday.
Former Premier League midfielders Alex Song and Javier Mascherano look set to be paired together in the heart of the Barca back four for the Champions League Group G showdown at the Nou Camp.
"Injuries are normally a headache for a coach but we have got what we have got. And all the players are at the right level to play for Barcelona," said Vilanova, who is without Gerard Pique, Daniel Alves, Carles Puyol and Eric Abidal as well as suspended midfielder Sergio Busquets.
"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 following Saturday's 5-4 victory at Deportivo La Coruna 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."