Barcelona has encountered a wave of injuries. The Spanish media "World Sports" wrote an article and talked about Flick's problem in formation.

Since Flick took charge of Barcelona, ​​injuries have been one of his main problems and have had serious consequences. The continuous, wide variety and serious injuries have restricted the team's management and all lineup arrangements. There are currently 11 players in the first team who have been or are missing due to injury, compared with 9 at the same time last year. The latest addition to the injured list is Pedri, who is the only player to start all 13 official games.

During Flick's tenure, Barcelona suffered a total of 38 injuries. This number means that an average of 2 to 3 players are missing per month. In the games that have been played this season, there are an average of 5 players absent per game. Starting from the fourth round against Valencia (6 players absent), this number began to rise: 5 against Newcastle, 5 against Getafe, 5 against Oviedo, 6 against Real Sociedad, 5 against Paris Saint-Germain, 6 against Sevilla, 7 against Girona, 6 against Olympiacos and 7 against Real Madrid.

So many injuries force Flick to frequently adjust his lineup. He never used the same starting XI for two games in a row, but most notably on offense, Flick had to do his best to adapt. Due to various absences, he was forced to use as many as 13 different strike combinations (including attacking midfielders). This is the most noteworthy point.

In the defense, because Ter Stegen has been injured since the beginning of the season, Juan Garcia has missed 6 games due to injury, which makes it even worse. Balde missed 5 games due to injury, and Christensen missed 2 games due to gastroenteritis. Although there are relatively few injuries in the defense, Flick has used 8 different defender combinations. In this regard, part of the reason is also because he has yet to find a central defensive partner that he is completely satisfied with. Eric Garcia switched from right back to center back, while Martin alternated with Balde at left back. A total of 4 different central defender combinations were used, with Araujo Cubasi and Eric Cubasi being the most used combination.

In Flick's most commonly used double midfielder system, there are two main combinations: the most common De Jong-Pedri combination, used in 8 of 13 games; and the Casado-Pedri combination used when De Jong cannot play, used in 5 games. The impact of Garvey's absence from 11 games was significant.

The personnel changes on the offensive end are the most obvious. If the attacking midfielders are also included in the forward line, then Flick used 13 different attack combinations in 13 games, which even resulted in some players needing to play positions they are unfamiliar with. The main reason is of course injuries: Fermín missed 4 games; Lewandowski and Olmo missed 3 games; Yamal missed 5 games; Rafinha missed 7 games; Drodo, who was a backup force, missed 3 games; Ferran missed 1 game. Rashford and Tony Fernandez have both played as center forwards in the "9th position".