Do you mean many of Barcelona players injured?
Indeed, Barcelona still has 4 injured players. There are Iñigo Martínez, Marcos Alonso, Pedri, Gavi, and Ter Stegen. Losing these players will bring big impacts for Barcelona performance. Specifically losing the main goalkeeper, Ter Stegen.
Meanwhile, Napoli only has 2 injured players, both of them are not the main players. So, Napoli has no problem with injured players.
In this matter, we can see that Napoli seems more ready for the match.
Barcelona faced with crucial problem injury because many of key player have been absent until the end of this season and they will absent on Champion League match phase of 16. Gavi, and Ter Stegen is the most important players for Barcelona who filled line up on every match, but loss him exactly with Ter Stegen Barcelona have conceded many goals last several matches and this proof how important him for Barcelona goal keeper. I think Iñaki Peña is not still on the top level performance with 5 matches in La Liga appearances he has conceded 8 goals and made one clean sheet only.
Its proof how weakness with Barcelona goals keeper and easily conceded many goals under Iñaki Peña and difference under Ter Stegen success made many clean sheet.