There was a loss for Xavi because he got 2 yellow cards against Atlhetico Madrid. This allowed Xavi to miss 3 matches. Against Las Palmas, Cadiz and Real Madrid. A disadvantage, because at the moment Barcelona is in improved form. They haven't lost after playing Villareal.
Las Palmas and Cadiz are not tough opponents for Barcelona so I think that Xavi not being able to accompany the team during these two matches will not have a big impact, now Brcelona is in top form with high self-confidence and this will make it easier for them when they meet tough opponents. the quality is still below them.
Xavi will only be able to accompany the team during the E Clasicco, this will be very interesting.
Xavi is a coach, so it doesn't look like the punishment is that long and as far as I know, when a coach gets a red card, it seems like the coach only misses one match so Xavi can't accompany the team in the match. Also, when a player gets a red card, at least the penalty is only missing one or two matches and not three matches. Thus, it will not be a problem if Xavi is not on the sidelines for Barcelona's next match in La Liga. Therefore, for the match against Real Madrid later, of course Xavi will be able to be on the side of the field to accompany the team in the match. In essence, red card penalties on players and coaches, I believe have differences punishment and are not completely the same and as such, I am sure Barcelona will still be fine.