At 20 years of age, the French winger has become the second most expensive buy in history having completed his move to the La Liga club.
Barcelona have completed a deal to sign Borussia Dortmund forward Ousmane Dembele for an initial £96.8m fee, potentially rising to £135.5m putting pen to paper on a five-year deal.
A delighted Dembele after completing his move said: “I’m very happy to be here. It has always been my dream to be in Barcelona and now I’m here I’m very happy to have achieved my dream.
“It is the best club in the world with the best players in the world.”