Brazilian winger Luis Guilherme has completed a move to West Ham United.
The Premier League side have paid a significant fee of more than £25.5 million.
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The 18-year-old becomes the first signing for new Hammers manager Julen Lopetegui.
"I’m very happy to be signing with West Ham United, a club that trusted in my work," he told the club's website.
The teenager added compliments to manager Lopetegui, admitting he could learn a lot from the Spaniard.
He went on to say: "The Premier League is the best league in the world.
“I believe I’ll improve a lot here with the entire staff at West Ham, which is crucial for my development."