Miazga told Chelsea’s website: “I am very happy to sign for Chelsea, a world-famous club with a reputation for major success.
“I am delighted to be in the Premier League, the best league in the world, and can’t wait to meet my team-mates and get going.”
The fee has not been confirmed, but is thought to be in the region of £3.5m.
Chelsea have now signed two players in two days, having completed a loan deal for Alexandre Pato yesterday evening.
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Editor of Sporting Post
Editor of Sporting Post