Manchester United suffered their first pre-season defeat on Thursday morning following a somewhat underwhelming display against Barcelona.

While in attack the Red Devils always looked a threat, with Marcus Rashford and Paul Pobga the stars, defensively they were poor.

Time and time again they allowed Barcelona's deadly trio of Lionel Messi, Luis Suarez and Neymar space to dictate and create openings, which eventually led to the only goal of the game.

Messi's failed pass in the 31st minute still found its way to Neymar, who fooled Antonio Valencia with a neat turn inside the 18-yard box before beating David de Gea.

United's defence switched off on a number of occasions throughout the 90 minutes, which prompted a scathing analysis from Jose Mourinho.

"It was a good game for the crowd and I think in pre-season it's important also to play for that when you come to the US and you have a stadium with 80,000 thousand very enthusiastic fans," he said.

"This is what they want, they want Messi, Neymar, Pogba, they want the best players to show what they are.

"And I think first half it happened but it could have been any score. It was an open game, we didn't defend well, I'm not happy.

"In the second half there were lots of changes for them and for us, but both teams played for the result.

"We tried to equalise, they tried to keep the ball, possession and defend well so I felt in the second half it was still a positive match."

Mourinho was far from impressed with his side's defending, though he'll also have been peeved by Romelu Lukaku's open-goal miss from five yards in the third minute.

In the below highlights reel from the game at 0:25, Rashford plays a wicked cross into Barcelona's box but Lukaku, albeit on the stretch, fires over from point-blank range.

BARCELONA 1-0 MAN UTD HIGHLIGHTS

As we know, Lukaku was made to pay for not finding the back of the net as Barca went on to score 30 minutes later and record a 1-0 victory.

The Belgian's horror miss earned him a disappointing 6/10 match rating by Manchester Evening News - but he didn't receive the lowest.

Valencia, Victor Lindelof, Chris Smalling and Daley Blind all received 5/10 and under, with M.E.N giving Blind the worst rating of 3/10.

"Having a poor tour. Wasteful down the left despite enjoying plenty of space and sparked the attack which resulted in Neymar scoring," was how the Manchester-based publication described Blind's display.