All Spanish clubs play with a league logo patch to their right arm sleeve for matches in the Spanish La Liga.
On most replica jerseys the patch found is a 7 cm embroidered patch. But in reality the one used on the field and by the players is a 10 cm plastic badge.
This official player’s size LFP badge cannot be applied on the replica kit since the replica size embroidered badge comes pre-printed. But on the a few select kits like the FC Barcelona home jersey player’s version or the Real Madrid third jersey it is possible because no badge comes pre-printed from the producer.
Below an example of a Barcelona match jersey with the official LFP player’s size badge applied.
The jersey in the image is probably a small size or maybe a Medium size since the badge takes up the mayority part of the sleeve covering the biceps.