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New season, same problems for 'embarrassing' Manchester United (0:53)

The fear factor of Manchester United has been lost after their loss to the Seagulls. It was 0: 53.

12:30 PM ET

A lack of self belief is to blame for Manchester United's opening day loss, according to the club's manager.

Ten Hag's first competitive game as United boss ended in a 2-1 defeat at Old Manchester as the Dutchman's reign got off to a bad start.

After a positive start, Ten Hag said the team's confidence had crumbled after a 2-0 half-time deficit.

The Man Utd show are familiar flaws.

"After we dropped down a level of belief and made mistakes, the opponent punished us," Ten Hag said in a news conference after the game.

There is a lack of belief after last year. Good players and self belief are what they are.

Manchester United's Erik ten Hag said his team lacked self belief. Photo by Jan Kruger/Getty Images

I know it can happen, but I think we should have done better and it won't happen overnight. During the first half we had a bad period and we need to learn from that. It's clear.

Christian Eriksen was used as a false No. 9 by Ten Hag in the first minute.

After Anthony Martial was ruled out, Ten Hag defended his decision to bench the older man.

I would have played him if there was an available one. We didn't start him because he's too short for 90 minutes in team training and it's 10 days since he last trained. There are two strikers,Martial andRonaldo.

He had two really good chances, but the typical nine wasn't available, so we thought he was a forward.