Reduce 8 points in 9 matches when it comes to Real Madrid? This is impossible. Xavi will now try to focus all his attention on the Champions League matches with PSG, very soon they will have their first game in Paris, I assume that this is the only thing Xavi is thinking about now. Even if Girona overtakes them in La Liga again, this will not change anything since Barcelona is not fighting for the championship and, frankly speaking, they have no chance.
8 points are big difference and Barcelona will need two big conditions. They must win all their last 9 matches in La Liga, this task is difficult to achieve but assume they can do it, they will still need a second condition. Real Madrid must drop more than 8 points in last 9 matches and this second condition is even harder than the first condition.
Combination of two hard conditions, gives Barcelona very slim probability to succeed. They can hope and continue to fight in next matches because they have to secure their second position too, not only to aim at the first position in La Liga.
They have another big competition, Champions League with two quarter final matches, so they have to pick their main priority when the season is coming to very last weeks.