Celtic have signed Osaze Urhoghide from Sheffield Wednesday on a four-year deal.
The 20-year-old defender was out of contract and chose to join new manager Ange Postecoglou as the first signing of the Greek-Australian's era after he took over in June.
Netherlands-born Urhoghide began his professional career with AFC Wimbledon in 2018, before he joined Sheffield Wednesday in 2019 and made 19 appearances over two seasons for the Championship side.
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Postecoglou said of Urhoghide's signing: "It's great. He's someone that the club's been tracking for a while and when I came on board, I managed to have a meeting with him and he's a good young man, he's very ambitious.
"He's just beginning his football career but he shows all the attributes on and off the field to want to become a top player, so it's great to get him here. He can play a couple of positions at the back and, most importantly, he's really keen to learn and develop and I think this will be a great environment for him.
"He's a modern defender. He's good athletically, he's mobile, he's quick and he wants to get on the ball. He can play a couple of different positions, and from our perspective, and the way we want to play our football, there are certain things I look for in players irrespective of age, and he's got some really good attributes to be a top defender.
"The most important thing is, he's got a real desire to reach the very top. He's excited about joining the club, which is important to me because that's the first thing I want to hear from players, that they're really keen to join us."
Urhoghide joins former Sheffield Wednesday teammate Liam Shaw at Celtic. The midfielder signed a four-year contract after agreeing a pre-contract agreement in March.