FC Barcelona plays in the UEFA Champions League and in the Spanish La Liga. They wear a badge to the right arm sleeve according to the tournament in which any given match takes place.
![](https://www.idfootballdesk.com/wp-content/uploads/2021/10/barca-h-21-22-la-liga-720x1024.jpg)
In this case the jersey is worn in a match in the domestic league La Liga.