Why is No. 66 banned in La Liga?

Why You Won't See No. 66 in La Liga

Unlike competitions like the Premier League, where players often sport iconic high numbers—such as Trent Alexander-Arnold famously wearing No. 66—Spain's top flight operates under far stricter regulations. In La Liga, you will never see a senior player stepping onto the pitch with a number in the sixties.

The Spanish football association enforces a rigid jersey numbering system. Players officially registered with the first-team squad must wear a number between 1 and 25. Meanwhile, numbers 26 through 50 are strictly reserved for reserve and youth team players called up to assist the main squad during the season.

Because of this regulation, any number above 50 is completely off-limits in Spanish professional football. When high-profile stars move to Spain, they are forced to relinquish their signature high numbers and pick an available shirt within the mandatory first-team range.