The 22-year-old left-back has joined the Spanish club in a deal worth €50m (£43m) and has signed a six-year contract.
Carreras was part of Real Madrid’s youth set-up from 2017 to 2020 before joining Manchester United.
He had spells on loan at Preston and Granada but did not play for the Old Trafford club’s first team prior to a switch to Benfica in January 2024.
Carreras initially joined the Portuguese side on loan and then made the move permanent for a reported £5m, external in May 2024.
In announcing his move to Real Madrid, Benfica said, external that Manchester United would receive 20% on anything above how much they paid for the player.
Carreras, who made 68 appearances for Benfica and scored five goals, helped them finish second in the Portuguese top-flight last season and was part of their squad at the Club World Cup.
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