Southampton have signed Lazio defender Wesley Hoedt on a five-year deal.
Sky Sports understands the fee agreed between the two clubs is around £17m.
The 23-year played with AZ Alkmaar before moving to Lazio in 2015. He becomes the Saints third signing of the summer alongside Jan Bednarek and Mario Lemina.
Southampton vice-chairman Les Reed said: "Wesley is one of the most promising young defenders in Europe and represents a significant addition to our squad.
"Having procured a Champions League finalist from one Italian club we have now added an Italian Supercoppa winner from another.
"We believe he has all the qualities to play a big part in our future, and we have worked hard to bring him to Southampton, with a number of other high-profile clubs interested in him.
"Finding a top quality central defender is difficult in the current environment and now we have six internationals in this position, both young and experienced."
Hoedt's arrival could potentially free up Southampton to sell disgruntled Liverpool target Virgil van Dijk, who has handed in a transfer request to the club.
Source: tribalfootball.com