Phillips, 26, came through the youth ranks at hometown Leeds and made his debut at the age of 19 in 2015.
He was converted from an attacking midfielder to a deep-lying playmaker by former manager Marcelo Bielsa and, after rejecting a move to Aston Villa, shone as Leeds won promotion back to the Premier League after a 16-year absence in 2020.
He earned his first England cap in September of that year and went on to start every game at Euro 2020, where Gareth Southgate’s side reached the final.
His final season at Leeds was disrupted by injury but ended on a positive note as relegation was avoided on the final day of the campaign.
Phillips admitted his decision had been a difficult one but now hopes to take his game to the next level.
“I have always loved Leeds and it is all I have ever known,” he said. “To come here is a big decision for me. It is a decision that took a lot of thinking about.
“It was just more the fact that I wanted to experience something different, how different teams work and how the fanbase works as well.
“I think I am pretty suited to playing in big games. I haven’t experienced many of them but hopefully this season I will do.”
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