Mustafi is Arsenal's first choice central defensive pairing alongside Koscielny.
Chelsea and Manchester City were linked with the 29-year-old centre-back in the summer.
Joe Gomez has been sidelined for almost a year with knee and Achilles injuries.
The United coach is ready to ring the changes again for the Premier League trip to Watford.
Former boss says Brazilian could fit into a back three.
Atletico Madrid star has split from his agent.
West Brom head of academy recruitment Steve Hopcroft still rues teenager's exit.
Stoke City striker was signed on deadline day to fill the gap left by departure of Lucas Perez to Arsenal.
Jose Mourinho's side kick-off their maiden Europa League group campaign in Rotterdam.
Antonio Conte says Spaniard is pushing for his first league start of the season against Liverpool.
His agent Wagner Ribeiro recently revealed that player was close to the Ligue 1 side and Old Trafford.
Bournemouth boss urges caution after on loan Arsenal midfielder undergoes ankle scan.
John Terry will miss the visit of Jurgen Klopp's side with a ligament injury.
Caretaker manager has no new injury concerns in the side that draw with Burnley.
Dutch league leaders host second-place PSV on Sunday.
Manchester United take on Feyenoord in the Europa League.
Former Tottenham star was forced off during 2-1 victory over Sporting.
Former Barcelona manager's side beat Mourinho's men 2-1 at Old Trafford.
Diego Costa has scored four goals in as many games in the league this season.
Manchester United take on Feyenoord in their first Europa League group game.
The Portuguese coach praises team after they claim second win in north London in three seasons.
John Terry suffered an ankle injury during Chelsea's 2-2 draw against Swansea.
Chelsea and Liverpool will face each other in the Premier League clash on 16 September.
Sir Alex Ferguson wrote a letter to Defour and wished him a speedy recovery.
Pochettino attacks his side's hunger after 2-1 defeat in front of record Wembley crowd.
Manchester United and Feyenoord face each other in the Europa League clash on 15 September.
Attendance of 85,011 sees the Ligue 1 team register 2-1 Champions League win at home of English football.
Brazilian said Mane, Roberto Firmino and Daniel Sturridge were virtually perfect against Leicester City.
IBTimes UK's coverage of Spurs' opening game at Wembley.
Sanches, 19, joined the Bavarian club in May, having previously been linked with the Reds.