The Brazil midfielder joined the Magpies from French side Lyon in January 2022, making 195 appearances in all competitions and scoring 31 goals.
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Though Newcastle were keen to hold onto the 28-year-old, he now joins Mikel Areta's side on a four-year deal for a fee believed to be £75m, as they look to defend their Premier League title as well as go one better in Europe and win the Champions League.
Newcastle, meanwhile, have a rebuild on their hands following the additional departures of stars Anthony Gordon and Sandro Tonali, as well as manager Eddie Howe.
More to follow...