I am having contrary opinion with regards to whether Barcelona should sell Lewandoski, l think Barcelona has many young promising players who could gain from the wealth of experience offered by Lewandoski, to get a young quality striker would cost Barcelona a lot of money considering their present financial issue, from my own point of view the club should keep Lewandoski and start grooming a new striker from the club academy just like how Yamal was promoted with his talent and quality which is already helping the club, Lewandoski had been in the game for a very long time his presence on the field would enable him motivate his younger team mates.
First of all, this shows you've not been following Barcelona's matches because if you have you'd know that Lewandoski shouldn't continue at Barcelona next season unless they can't get a better replacement. Lewandoski will be 37 years old this year, next year he will be 38, you do not want a player like that leading your attack. If you watch Barcelona you'll see that he can't run as he used to, he can't press defenders as he used to, and he scores goals, but other than that, he has depreciated a lot. If Barcelona are serious, this should be his last season with them so they can make some money from his sale. Barcelona have fixed their financial problems and can spend as much as they earn so they can afford to go into the market freely this summer.
Secondly, how often do you see players like Yamal come out of the academy? Those kinds of players are once-in-a-generation kind of players. they currently do not have a striker who can come out to replace Lewandoski in the future currently. Not every player will come from the academy, they have to sign players if they want to compete.