Alexander-Arnold says he'd already made his mind up before speaking with his England teammate about the move.
Speaking to Amazon Prime Video Sport, he said: “There was a lot of speculation… the ‘agent Jude’ stuff. It was more so in his first season (at Real Madrid).
“We’d meet up at England camps and everyone would want to know what it was like behind the scenes (at Real Madrid)… he said it was incredible, and he’d never seen anything like it.
“The drive from the whole club, to win and the expectation to win. He talked so highly of the club, and I’d made my mind up at the end of the day.
“I needed a change for me. I wanted a new challenge on and off the pitch.”
