I think everyone has been talking so much about how Barcelona's poor talent pool or 2nd lineup in case of 1st lineup got injuries. So far, I haven't seen Xavi try to address this.
I don't think players' injuries will really affect Barcelona's performance in the upcoming match, Barcelona have some good substitutes both in defense and in midfield. Araujo's injury will give Pique a chance to play, as will De Jong who may be replaced by Kessie. This season Barcelona have a lot of options for players in defence, midfielders and attackers and I think that will really help Xavi keep his team form this season when their main player is injured.
Barcelona's main and second line-up this season is good, so I don't think there will be big problems in the next few games even though a busy schedule awaits. I want to focus on the match against Mallorca, so I don't have much reason to worry about the possibility of Barcelona failing to get the 3 points.