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England right-back Trent Alexander-Arnold addressed his audience in Spanish when he was presented as a Real Madrid player on Thursday.
The former Liverpool player called signing for Real "a dream come true" and said it was a "huge responsibility" to play for the 15-time European champions.
Alexander-Arnold, 26, would have been able to leave Liverpool on a free transfer at the end of his contract on 30 June but Real Madrid paid the Reds a fee to release him early so that he could play for them at this month's Club World Cup.
A highlights video showing Alexander-Arnold as a young player plus his goals, assists and defending for Liverpool and England was played prior to Real president Florentino Perez welcoming the right-back to the club.
Alexander-Arnold, who was sat with his girlfriend, Estelle Behnke, his parents and brothers, then took to the stage and addressed the audience - which included former Real Madrid left-back Roberto Carlos - in Spanish.
"Thank you so much to President Florentino Perez and Real Madrid for this opportunity," he said.
"Signing for a club like Real Madrid doesn't happen every day.
It's a dream come true.
I'm eager to show the club and the fans what I can do."
Alexander-Arnold said he is "ready to give everything for the team and for the Real Madrid fans", adding: "I want to show them what I can do, I want to win many titles, be champions, and continue to grow and enjoy football with the best in the world."
The two-time Premier League champion was then pictured with Perez holding the Real Madrid jersey, with the shirt showing Trent instead of Alexander-Arnold and the number 12 rather than the 66 he wore at Liverpool.