MANCHESTER United conceded three goals in a 20-minute span in the first half of a 3-2 loss to Brighton in the Premier League on Sunday.

A few hours after Manchester City strolled to a 6-1 win over Huddersfield, United showed the gulf that currently exists to its fierce rival by succumbing meekly to its first loss of the season.

Glenn Murray marked his 200th Brighton appearance with the opening goal in the 25th minute, before further goals from Shane Duffy and Pascal Gross — from the penalty spot — left United reeling.

Romelu Lukaku scored for United to make it 2-1 and captain Paul Pogba converted a stoppage-time penalty with virtually the last kick of the game. By then, a battling Brighton side had done enough to earn a second straight home victory over Jose Mourinho’s side.

A surly Jose Mourinho spent the buildup to this clash choosing to criticize rival Manchester City’s fly-on-the-wall documentary released this week, saying “you can’t buy class” in reaction to the behind-the-scenes account of last season at the Etihad Stadium.

When Brighton’s fans sang “Your city is blue” in the final moments of the game, humiliation for United and Mourinho was complete.

This was just the 10th time in Premier League history that United conceded three first-half goals, and the first time since their 3-0 defeat at Arsenal in October 2015.

(SD-Agencies)