Barcelona have defensive problems at the worst possible time Champions League - Tottenham vs Barcelona Question marks hang over their back four

Catalan giants Barcelona are experiencing some problems in their defence at the worst possible time.

Ernesto Valverde will not be able to count on Sergi Roberto nor Samuel Umtiti in their important Champions League battle against Tottenham Hotspur on Wednesday, as both players have picked up injuries.

The versatile Sergi Roberto pulled a muscle during Barcelona's weekend clash against Athletic Club while Umtiti, who besides being suspended for this match after his red card in the previous Champions League duel, has some discomfort in his left knee.

However, Nelson Semedo and Clement Lenglet will be their replacements against the London side, who have scored 14 goals in their seven matches played in the Premier League.

And the star man for the English team is Harry Kane, the top scorer for Spurs with five goals.

Therefore, Barcelona's back four must be at their best on Wednesday.

Valverde will most likely start the game with Semedo, Gerard Pique, Lenglet and Jordi Alba forming the defensive line.

And this formation at the back is not new for the team, as all four of these players started together against Sevilla in the Spanish Super Cup, and against Girona and Athletic Club in LaLiga Santander.

With that quartet, the Catalans have claimed one win and two draws.

Sergi Roberto and Umtiti are the two defenders who will miss the decisive game in London and it has come as a huge loss for Lionel Messi and company.

Both the Catalan right-back and the French central defender give more reliability in defence and also help the transitions in the attack.

On the other hand, Semedo and Lenglet, who are still adapting to the club and the style of play, have not yet reached the level of their teammates.

Therefore, Barcelona's defensive line is perhaps the most fragile for their upcoming game against Mauricio Pochettino's men.

Harry Kane awaits them

Barcelona visit Wembley in the middle of a sea of doubts, especially at the back.

The Blaugrana have conceded eight goals in seven matches, only keeping a clean sheet in two games, further confirming that the strong defensive wall has vanished for Barcelona.

And Pochettino's Tottenham will want to take advantage of this crisis.

The English team have averaged two goals a game in the Premier League and their top scorers are Harry Kane, with five, and the Brazillian Lucas Moura with three.

Kane was the second highest goal scorer last year in England with 30 goals, behind Mohamed Salah, who netted two more than the 25-year-old.

But in the European competition, Mauricio Pochettino's men have only scored one goal and it came thanks to the Dane Christian Eriksen.