Listen to the full interview with Graham above via the Off The Ball Football Show podcast
From week to week, the perception of Barcelona continues to change.
At some points they look to be back in ominous form but at others they look on the verge of a crisis.
No one knows the club better than our European football correspondent Graham Hunter and he felt this week was really Jekyll and Hyde.
"In all my life either as a football fan or as a journalist, I have never seen a transformation of personality as radical as Barcelona losing 1 - 0 at the weekend and being able to beat Manchester City comfortably last night. The transformation was extra-ordinary and if we were to draw conclusions about where Barcelona are at for the next six or seven games or whether they are in terminal decline, I think we'd be with a false friend because the difference between the two matches was abysmal."
But Graham believes the current Barcelona team are athletically unable to play with three out and out strikers. Last night saw Barca play four midfielders with Xavi, Andres Iniesta, Sergio Busquets and Cesc Fabregas all starting in midfield and he believes that the four-man midfield will be the template used by manager Gerardo Martino against teams of Barcelona's level.
"Effectively with all the success coming via a 4-3-3 formation, he must rely on what is effectively 4-4-2," said Graham.
Another team that plays a different version of 4-4-2 is Atletico Madrid who booked their place in the Champions League quarter finals with an impressive 5 - 1 aggregate win over fallen giants AC Milan.
"I thought against Milan in the two matches, they were exceptional. In Milan, they had to cling in and they showed that the learning trajectory in the Europa League serves them well when they step up to the Champions League and they look like a fully fledged European mob," said Graham.
Graham also told us what Barcelona fans think of Pep Guardiola's work at Bayern Munich and whether Barca can possibly win the Champions League despite domestic problems.
