Osasuna will be facing barcelona first before it will have met real madrid in copa del rey. it's a hard time for osasuna.
Barcelona may be able to beat osasuna and take full points. That will give pressure to the osasuna.
Two tough matches await Osasuna. If they want to keep their position unchanged in the points table in La Liga, they must play well against Barcelona and earn points. But it is not an easy task at all. Barcelona is a strong opponent. And the most important thing is that it is Barcelona's home match. It is very difficult to win against Barcelona at home.
After the match against Barcelona, Osasuna will play against Madrid in the Copa del Rey match. Madrid will definitely want to secure the Copa del Rey title. Because they have no chance of winning the La Liga title. I think Osasuna lost a few matches in a row.