Juventus and Sevilla are weak teams this season, I am sure Barcelona will have no difficulties beating them. In theory, only Arsenal, Man United, and Ajax have the chance to beat Barcelona. However, sometimes there is a surprise in football matches, unfavorite teams can beat favorite teams. Barcelona isn't impossible to repeat the same failure as previously. So, Xavi can't focus on the big teams only, they also must be careful with smaller teams.
Oh, I would still not be in a hurry to throw around phrases about the fact that it will not be difficult to win in relation to the current Barcelona. If we recall the history of last season, it was in the matches of the European cups that Barcelona for some reason was not as bright as in the matches of the Spanish championship. So I wouldn't be too surprised if history repeats itself this season. Moreover, the cup system is insidious, and unlike the championship or the group tournament, you have only one match to correct the situation if you unsuccessfully played your first match. Juventus really does not look impressive yet, but it has not even passed the middle of the season to draw far-reaching conclusions about the strength of the teams. The head coaches still have enough time left to correct the game and the results of their wards.