The 20-year-old transferred from Chelsea to the south coast club in 2021 for £5 million.
After Southampton was demoted from the Premier League last season, Livramento left.
After suffering an anterior cruciate ligament injury in April 2022, the defender for England’s Under-21 team played in just two games last season.
In Southampton’s final two contests against Brighton and Liverpool, he entered as a substitute.
In the 2021–22 season, Livramento played 32 games, including 28 in the Premier League.
Sandro Tonali, an Italian midfielder, and Harvey Barnes, an English winger, have both been added to Newcastle’s roster this summer as the Tyneside club looks to build on its top-four finish from the previous year.
On August 12, Eddie Howe’s team welcomes Aston Villa to their home stadium to kick off the new Premier League season.