The Spaniard's former bosses tell IBTimes UK why the striker will light up Stamford Bridge.
Coutinho has been heavily linked with a move to Barcelona.
The trio were heavily involved during Arsenal's pre-season tour of Australia and China.
Barry completed a move to West Brom after four years at Everton.
Foyth has represented Argentina in the Under-20 World Cup.
Sanchez missed the opening Premier League game of the season due to an abdominal strain.
Sakho is no longer included in Liverpool manager Jurgen Klopp's plans at Anfield.
Coutinho and Borussia Dortmund's Ousmane Dembele are wanted by Barcelona.
Matic, 29, joined United in a £40m transfer last month.
Brazilian centre-back has penned a five-year contract in Spain that includes an €80m buyout clause.
Spurs could go six points clear of Chelsea if they win the first ever Premier League match to be played at Wembley.
Red Devils boss happy with current squad and prepared to wait until January to make further additions.
Spurs boss admits he wants to bring in a quartet of players before the transfer window shuts on 31 August.
Sigurdsson, 27, became Everton's record signing when he arrived at Goodison Park for £45m earlier this week.
Chelsea have just one recognised central midfielder available ahead of their clash with Tottenham.
The exiled Blues striker has accused his club of pricing him out a move to Atletico Madrid.
Ernesto Valverde's players hold minute's silence in honour of victims of the terrorist attack in Barcelona.
Jose Mourinho confirms that duo will play for Ricky Sbragia's Under-23s at Leigh Sports Village.
Barca have admired Coutinho and Dembele for some time, according to club director Robert Fernandez.
Toffees finally completed £45m deal for Sigurdsson ealrier this week.
De Gea has two years left on his contract at Old Trafford.
The Chelsea boss will be without the suspended Cesc Fabregas and Gary Cahill.
England right-back will be assessed on Saturday after recovering well from ankle ligament damage.
La Roja head coach Juan Antonio Pizzi expects in-demand talisman to be available for World Cup qualifiers.
Eagles boss refused to rule out a move for RB Leipzig winger Olivier Burke.
Spain Under-21 international spent last season on loan at Alaves.
Sanchez joined Ajax from Colombian outfit Atletico Nacional last summer.
23-year-old has served as Los Blancos' third-choice 'keeper during the last two seasons.
Bailly says he's ready to follow in the footsteps of Nemanja Vidic and Jaap Stam at Old Trafford.
Southampton have reportedly offered £15m for Lazio's Hoedt.