The 23-year-old star has been heavily linked with a return to Old Trafford.
France international becomes club's third summer signing following Samuel Umtiti and Denis Suarez.
The France international's agent says no contact has been made by the Serie A club.
Gunners reportedly exploring swap deal involving Olivier Giroud to bring Argentina striker to Emirates.
West Ham are also reportedly interested in luring him back to the Premier League.
Black Cats boss has emerged as a front runner for the vacant role.
Fletcher signs four-year deal with Olympic Stadium club after Man U contract expired.
The Former Barcelona star will have his first experience in the top flight.
The 22-year-old has signed a 3-year contract with the Latics after passing a medical.
Balotelli is currently training with the Liverpool squad at Melwood.
Manchester United can try to sign Fabregas if he becomes surplus to requirements at Chelsea.
27-year-old joined the Blues in 2013 from Russian side Anzhi Makhachkala.
Dutch midfielder helped PSV Eindhoven win league title last season.
18-year-old Reid joined from Arsenal in 2012.
Reports had suggested Arsene Wenger was ready to meet striker's release clause.
Reports in Spain claim that the club have already agreed terms for the transfer of the France international.
Under-21 boss Michael Beale says European Championships have delayed decision over loan deals.
Independiente del Valle confirm 16-year-old is travelling to Germany.
Emmanuel Petit claims Juventus midfielder Paul Pogba is not worth £100m.
German star's agent has told Spaniards that Premier League sides are after him.
France international signs five-year deal with a €60m release clause.
Portuguese boss confirmed he intends to deploy Rooney further forward this season.
Marcel Desailly believes Conte influenced decision to award new contract to John Terry.
Hugo Lloris' France failed to beat Portugal in the Euro 2016 final.
Reece Oxford is currently with the England U-19 team in the Euros.
The 25-year-old striker joined the Reds in 2014.
The 16-year-old will work with head of academy Nicky Butt after joining from FC Zurich.
The 29-year-old midfielder was one of the best players at Euro 2016.
Antonio Conte's side and Arsenal have been linked with a £65m battle for his services.
Juve director general Giuseppe Marotta says the Gunners U-turned over valuation of the Chilean.