A few weeks ago

Polkadot could be Barcelona's new master sponsor

FC Barcelona Releases Its Cryptocurrency - Medium

A few weeks ago, the news also emerged that Binance and FTX were also vying for the main space on the Barcelona shirt, but apparently, the negotiations have not

Polkadot In Race To Become FC Barcelona’s Official

FC Barcelona Chooses Spotify Over Crypto Sponsors

Polkadot Could Become FC Barcelona’s Official Jersey

It was

It was, but Barcelona decided in the end not to go with anybody in the crypto space.

Was Polkadot really in the race to become one of Barca's sponsors?

Binance in talks with FC Barcelona over sponsorship