It started on the final shrill of the referees whistle at the Emirates Stadium after two stoppage-time goals saw Arsenal take the spoils and condemn United to their second defeat in four games. A few hours later and the social media timeline was ablaze with controversy.
Jadon Sancho had released a social media statement firing back at Erik ten Hag after he left the winger out of the matchday squad against Arsenal due to training levels. He has since deleted the post but this is the first issue Ten Hag must address.
With the reason for Antony&aposs unavailability well-publicised, Sancho would have been in line to start on the right but for his public rebuttal. Instead, his future looks hazy and Ten Hag is to decide whether Sancho has a future in his squad plans.
If not, Facundo Pellistri is the only natural right-wing alternative available, although Bruno Fernandes has been used in the position at times. So has Marcus Rashford but both, Uniteds two biggest attacking threats, become much less effective when moved there.
Amad fans will be rueing that the Ivorian is currently out injured as an opportunity presents itself. He is one of a lengthy list of players currently sidelined.
Raphael Varane, Kobbie Mainoo and Mason Mount were all ruled out for the first part of the season, a very ambiguous term used by the club that could mean their return is nearing or in fact still far off.
Ten Hag traditionally keeps his cards to his chest when it comes to setbacks but he will be expecting to be quizzed on certain players. One of those will be Sofyan Armabat who withdrew from the Morocco squad with an unspecified injury.
The nature and severity of his issue is unclear but anything longer than a weeks absence would frustrate supporters, who have already had to wait for Rasmus Hojlunds delayed debut. Bayern Munich await in the Champions League next week too, the kind of fixture Amrabat has been brought into the club to affect.
Meanwhile, Argentina have provided some cause for concern after Lisandro Martinez was omitted from their matchday squads entirely against Ecuador and Bolivia. He came off at the Emirates with a foot issue although has trained with the world champions with boss Lionel Scaloini insisting he is fine.
Victor Lindelof has recovered from the sickness that forced him off against Arsenal while Englands Harry Maguire and Jonny Evans of Northern Ireland played in both of their countries fixtures. Ideally, though, Ten Hag will want Martinez to be fit and will provide an update on Friday about his condition.
Ten Hag must also decipher whether Hojlund is fit enough to start against Brighton. The striker tallied a little more than 75 minutes across two substitute appearances for Denmark following his 30-minute debut for United against Arsenal.
Denmark boss Kasper Hjulmand insists that the attacker is back to his old self having worked with the 20-year-old since giving him his senior international debut just under a year ago. So thats something.
