I have seen many news that Barcelona and Bayern Munich are going to finalize the deal regarding Lewandowski. Since Lewandowski does not want to stay with Bayern Munich. So Munich finalized the deal with Barcelona. Barcelona recently signed Raphinha. Now they will be stronger if they have an experienced player like Lewandowski on the team. And to be sure, Xavi is aiming for both the Champions League and La Liga titles next season.
Also this seems like should be the last signing for Barcelona as I think their squad is all complete now. Furthermore signing will only add to their financial problems.
Barcelona cost around 58 million to sign Raphinha. And getting Lewandowski into the team is going to cost Barcelona more than 50 million. Barcelona has to take loaned a huge amount of money. If they don't win a title next season, they will face more problems financially. So besides strengthening the team, stabilizing the team is a very big challenge for Xavi. At the same time, Lewandowski has to prove his own abilities.