Valverde's side have only scored four goals in four games, only one more than the worst record (3) in 2009-10.
It is not normal that Barcelona has only scored four goals in four Champions League games being a team with such high offensive potential.
No goals at Dortmund (0-0) and at home against Slavia (0-0), two goals each against Inter (2-1) and Prague (1-2) but there are up to 22 teams ahead of Barcelona in the current group stage.
You have to go back to the 2009-10 season, with Pep Guardiola on the bench, to find such a low record.
In those first four games, the team only scored three after tying against Inter (0-0), winning Dinamo Kiev (2-0), losing to Rubin Kazan (1-2) and tying (0-0) in Russia.
In 1997-98, with Louis van Gaal as the coach, they only scored four goals with the worst points (1 out of 12).