Barcelona's performance in the last 3 seasons is very weak. Barcelona's performance has deteriorated since Koeman became Barcelona's coach. Although Xavi has been able to stabilize the team, he has not yet been able to form a completely strong team. Barcelona need more experienced players in defense. At the same time now Barcelona needs experienced striker. If Lewandowski joins Barcelona, I think Barcelona will be stronger. Next season, the title fight between Barcelona and Real Madrid will intensify.
It's true, Xavi is just laying the foundations for Barcelona, his job is to create a team that is still very big and could be a very long journey. This is just the beginning for Xavi and must make at least a team filled with players who can be trusted. In the transfer market he has to take advantage of that to get back into the position they still need.