Luiz signed a three-year contract after Chelsea paid a reported fee of 30 million pounds (39 million dollars), two years after leaving the London club for France in a 50 million-pound deal.
The 29-year-old defender won the Champions League, FA Cup and Europa League in his first stint at Chelsea before moving to PSG, where he captured a treble of trophies each of the last two seasons.
“I’m delighted to return to Chelsea,” Luiz said on the club’s Chelsea’s website.
“We had a fantastic story during my first time at the club and I want to help the team and [manager] Antonio Conte achieve a lot of success. I always had a wonderful relationship with the fans, and I am looking forward to wearing the blue shirt at Stamford Bridge once again.”
Chelsea added another defender by signing Marcos Alonso from Fiorentina.
The 25-year-old returns to the Premier League after having previously played at Bolton and Sunderland.
“It’s a step up in my career, and I think this is the perfect place for me to continue developing,” Alonso said.
“It was an easy decision for me to make when I heard the club were interested in signing me.”
Arsenal midfielder Jack Wilshere and Manchester City goalkeeper Joe Hart, members of England’s Euro 2016 squad, were sent out on season-long loans as they look to secure first-team football.
Wilshere joined Bournemouth in an attempt to revive his injury-plagued career.
The 24-year-old has been limited to just 66 league matches over the last five seasons and has fallen down the pecking order at Arsenal.
“Jack is a fantastic addition to the club,” Bournemouth chief executive Neill Blake said. “He will bring a wealth of international and Premier League experience, so we are delighted to be able to welcome a player of his caliber to the club.”
Hart, 29, joined Italian side Torino after losing his starting job at Manchester City to Willy Caballero.
“Suddenly, my career has been an important turning: it was a sign,” Hart said on Torino’s website. “Torino’s offer came in the right moment, with the right manner.”
New City manager Pep Guardiola sent three other internationals out on loan as he continues to shape his squad.
Ivory Coast striker Wilfried Bony joined Stoke City, and France team-mates Samir Nasri and Eliaquim Mangala headed to Spain to play for Sevilla and Valencia, respectively.
Premier League champions Leicester City broke their transfer record by signing striker Islam Slimani from Porto on a five-year deal for a reported 29.7 million pounds.
Two other clubs set new marks, with Burnley paying 10.5 million pounds for Derby midfielder Jeff Hendrick and Sunderland signing Lorient midfielder Didier Ndong for 13.6 million pounds.
In other moves, Spanish World Cup winner Alvaro Arbaloa, who played last season at Real Madrid, joined West Ham on a one-year deal, and Netherlands defender Bruno Martins Indi moved from Porto to Stoke on a season-long loan.
Tottenham signed Newcastle midfielder Moussa Sissoko and Marseille winger Georges-Kevin Nkoudou, and Enner Valencia joined Everton on a loan from West Ham.
Source: GNA/News Ghana