The sad thing for Barcelona is about their next games where they don't have two effective players Frankie De Jong and Lewandoski.
De Jong got injured in the game they had against Celta de Vigo and that's why his situation for the next three games and even for the game against Real Madrid is not clear yet.
Also, Lewandoski got injured in the Champions League against Porto and he is still injured.
This can be a pain for Xavi to find an alternative strategy and play without both palyer against a team like Real Madrid.

Barcelona match before meeting Real Madrid still has several things to complete without these two players and Xavi has prepared everything from strategy and placement of players to replace Lewandowski and De Jong so that there is still chance of hope for Barcelona to win.
However news about the progress of Lewandowski and De Jong cannot be heard for certain whether they can recover more quickly or not considering that after the last rumors that they could recover and take part in the match against Real Madrid no new developments have emerged.
The hope of all Barcelona fans is that these two players can take part in the match against Real Madrid because if they are not there Barcelona will definitely have difficulty competing with Real Madrid.
Xavi has stated that he has several strategies and plans that will be used to overcome the absence of Lewandowski and De Jong but he did not reveal how and what he will do.