There has also been tension between Mourinho and Pogba, the club's most expensive signing, and a high-profile pre-season spat with the France forward Anthony Martial.
Even after scoring the early goals, they didn't take the foot off the gas as the United opener came out of nothing really.
The Australian wrote on Twitter: "Far too much focus on Mourinho after Man Utd's poor display v Brighton".
"It will get better and United will get stronger with players back". He will be a popular choice for Manchester United fans who have been starved of the fluid, attacking football the team was noted for during the Sir Alex Ferguson era.
"I think there is a lot of hype around the Premier League", said Murray. They have always judged themselves by Premier League titles.
None arrived and the only defensive recruit was Dalot, who adds competition in the full-back areas along with Antonio Valencia, Matteo Darmian, Ashley Young and Luke Shaw. Any views should be kept in-house and not appear in the press.
Glenn Murray believes Premier League "hype" is a barrier to lower-tier talents realising their full potential in English football.
As a Brighton supporter, the highlight of the match for me was the crowd singing "Can we play you every week?" to the tune of "Cwm Rhondda / Bread of Heaven".
The captain, who has scored two penalties in their opening two games, pointed to the team and himself as being responsible for the defeat that was secured by half-time in which they had conceded three goals.
During the off-season, Jose Mourinho was constantly complaining about his side's preparations for the new season which included a 4-1 thrashing by Liverpool in the United States.
"That's twice in a row we've lost against them here", said Pogba.
"United have got good players and strength in depth, but they need to be let off the leash".
"They won't drop out of the Champions League places as they are still good enough to get the top four".
"I think United fans accepted second previous year because they were behind a City side breaking loads of records". When times are tough you go back to basics, primarily because improvising requires bravery; United find it hard to move fluidly, make daring runs, or attempt risky through balls when an air of impending doom hangs in the air. "I'm not so sure". These football days are taking place across the United Kingdom this summer, giving thousands of children the chance to enjoy the game.