Seven of Peter Bosz's side could be unavailable for various fitness and injury concerns.
The Spanish midfielder missed the 5-0 victory over Espanyol due to a knee injury.
United reportedly tabled an £85m offer for the German in the summer of 2015 but Muller chose to stay at Bayern.
Janssen joined Fenerbahce on a season long-loan from Spurs on last day of Turkish transfer window.
Mourinho will not start Argentine 'keeper Sergio Romero, who kept goal for United in the Europa League last season.
The Dutchman was sacked after just 77 days as Palace lost first four games of the season.
Mendy became the world's most expensive defender when he joined Manchester City for £52m.
Sami Khedira, Claudio Marchisio are also unavailable due to different injury problems.
Arsenal were ready to pay a Premier League record £91m to sign Lemar this summer.
The Blues boss hinted he will rotate his squad for the visit of Qarabağ FK.
Former Manchester City forward suffered an injury during the Saturday's 3-0 victory over Eibar.
The Spaniard spoke to IBTimes UK following the Gunners' 3-0 victory over Bournemouth.
Coutinho was not included in the team that was comprehensively beaten by Manchester City.
Wenger has won three titles at Arsenal and seven FA Cups.
Wilshere did not leave Arsenal during the transfer window and has just one year left on his contract.
Former England manager Roy Hodgson is the favourite to replace the Dutchman.
Ander Herrera has fallen behind Nemanja Matic in the midfield pecking order at Old Trafford.
Coleen wants them to get away as a family," a friend has said.
Roberto suffered a knee injury during Friday's training session, prior to Espanyol clash.
Yerry Mina will spend the current season with Palmeiras and join after the World Cup in Russia.
Bayern allowed Sanches to join Paul Clement's Swansea City on loan.
De Bruyne has registered 20 assists in the Premier League since the start of last season.
Ings has not played for the first-team since undergoing surgery last October.
The Gunners begin their Europa League campaign against Germany's bottom side.
A 1-0 win for Sean Dyche's side leaves Palace still pointless and goalless this season.
In an interview with The Sunday Times, Mourinho discusses his three-year plan.
The Belgian returned during the international break after ankle surges this summer.
Messi's father has already signed a deal on behalf of his son, according to Barca's president.
The France international provided an impressive performance in the 3-0 win over Everton.
Antisemitic song to ring out from the Chelsea supporters' section came on Saturday, when the club's new player, Morata, scored a goal.