Despite this, Lewandowski did not appear to be the best rated player of the game but he was the worst rated player based on the aiscore. Kounde and De Jong were the two players who had the highest ratings in that match, but I agree that overall Barcelona didn't perform as good as expected in that match.
Lewandowksi isn't good like his was, I think his performance is declining in this season. If Joao Felix can show a good performance, I believe Barcelona will sign him to replace Lewandowski's position.
Osasuna is really good in counter attack, they can maximize their chance to score a goal. While Barcelona only keep passing in order to make them looks more dominant and giving pressure to Osasuna.
For me it doesn't matter if Lewandowski doesn't perform well consistently because after all, Lewandowski is no longer young at this moment. Therefore, with his old age, it will certainly be difficult for Lewandowski to keep playing well and consistently in every match. Because anyway, the end result for Barcelona in this match also in fact Barcelona still got 3 points and of course, with the three points that Barcelona got it in this match was still a good final result too. At least, I don't blame Lewandowski too much at 35 years old now.