Barcelona's heavy loss to Atletico Madrid with a score of 4-0 in the first leg of the Copa del Rey semi-final has put the team in a difficult position ahead of the return match. The game revealed several weaknesses that coach Hans Flick needs to work on correcting.

1- The team is performing intensely.

Atletico Madrid started with high intensity from the first minute, while Barcelona appeared at a low level as has happened in previous matches this season, leading the Catalan team to concede four goals during the first half.

2- The Tactical Factor

The absences of Raphinha, Rashford, and Pedri impacted Barcelona's lineup, with Flick placing Olmo as a false winger on the left alongside Casado in a double pivot, and Firmin in an attacking midfield position. Meanwhile, Simeone relied on Llorente and Koke with support from Giuliano and Lookman to control the midfield, leading to Atletico's dominance in this crucial area.

3- Weakness of the left side

Olmo and Balde's lineup couldn't fend off the opponent's attacks, with Molina being a constant source of concern. Meanwhile, Giuliano's enthusiasm helped bolster the team's offense. Three of the four goals came from Barcelona's left side, despite Flick's adjustments by bringing in Lewandowski and placing Ferran on that side.

4- The reaction stopped after the break.

Flick tried to correct the mistakes in the second half, and his instructions began to show in the first few minutes, as Firmin shot a powerful ball at Musso's goal. However, after seven minutes of anticipation due to a malfunction in the semi-automatic offside system, Koubarsi's goal was canceled for offside, which halted Barcelona's momentum and weakened their response.

5- The substitutions did not achieve the desired effect.

Unlike previous matches, the substitutions did not change the course of the game, as the involvement of Lewandowski, Cancelo, or Araujo was not decisive. Eric's dismissal affected Araujo's ability to participate in the attack, limiting the effectiveness of the tactical adjustments.