It seems that Xavi will use De Jong as replacement for Lewandowski if he cannot recover and play in the match against Real Madrid but De Jong is also playing after recovering from his injury so Xavi has to really consider everything so that nothing bad happens to his players.
However on the other hand some of the latest news also states that Lewandowski can recover on time and can even take part in El Clasico and this is good news even though it is not necessarily true.
But despite all the rumors that have been circulating it seems that Xavi knows more about the Barcelona squad so he can have better plan to be able to perform optimally in El Clasico.
Well, I also read some of the news portals that exist and yes, it is reported that Lewandowski has a chance to be able to play and be available to play in El Clasico later. Because of course, if Lewandowski is not available in the El Clasico match later it is very likely to have an impact on Barcelona's performance become bad. Moreover, at this moment Real Madrid has a very good squad whose quality will not be doubted. So yes, to play against Real Madrid, it is appropriate for Barcelona to be able to prepare the squad well to play well in the El Clasico match.