Chelsea have confirmed the signing of Alejandro Garnacho from Manchester United .

Garnacho arrives for a fixed fee of £40 million ($54m), sources have told ESPN, with the 21-year-old having fallen out of favour under Ruben Amorim.

Before the move was announced by either club, Garnacho was in the stands for Chelsea's home game against Fulham on Saturday, which the west London side won 2-0 .

Later that day, Chelsea confirmed Garnacho had signed a deal at Stamford Bridge until 2032.

"It's an incredible moment for my family and I to join this great club," Garnacho said. "I can't wait to get started. I watched the Club World Cup and to join the world champions is special -- we're the best team in the world! It's amazing to be here and I'm very happy."

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