“There is a certain point you have to accept decisions; I should do as well,” Ten Hag told reporters.
Asked if Sunday was one of his worst days on the job, the downcast manager told reporters: “Yes. Of course, it is disappointing.”
Players are expected to wear black armbands, with wreaths to be laid on the Old Trafford pitch and a minute’s silence observed before kick-off.
Despite dominating 78 ball possession, United could not salvage a point against Palace on their home turf.
Jonny Evans, who was making his first United start after eight and half years, provided Fernandez with the assist for the goal from the middle of the pitch.
Man United manager Erik ten Hag admitted his side displayed a horror show in the opening minutes of the match.
City are currently on three consecutive EPL title wins and seek to become the first EPL club to win four consecutive league titles.
They will face neighbours Manchester City in the finals on June 3 at Wembley Stadium.
The England international has been in fine form for Erik ten Hag’s side in recent months.
Scottish star, Scott McTominay, fires United ahead 36 minutes into the game courtesy of an assist from Jadon Sancho.
