Manchester United find themselves trailing 2-0 at the break at the Nou Camp in their crucial Champions League quarter-final second-leg tie.
Despite United ace Marcus Rashford hitting the bar in the opening minute, Ole Gunnar Solskjaer’s side have been second best.
There was no denying Lionel Messi when he gave the home side the lead after 15 minutes.
Ashley Young was closed down and when his clearance was blocked the Argentinian made the most of the space he was given to curl the ball into the bottom corner.
And the Argentine was at it again before the 20-minute mark as the ball broke to Messi on the edge of the United area but his shot looked too weak to beat De Gea in the United goal.
The keeper somehow allowed the ball to squeeze under his body to make the aggregate score 3-0 to the home side.
And McManaman beleives it was a lack of concentration from Spain’s No 1.
“What can you say about that one? It says it all really,” said the BT Sport commentator.
“It was a backpass from Lionel Messi that found its way into the back of the net.
“The goalkeeper takes his eye off it, it’s a lack of concentration, and the ball agonisingly rolls into the back of the net.
“Left-foot, right-foot, he just needs a header now.
“Manchester United have contributed to both goals they conceded early on.
“I said earlier it needed to be the perfect performance and it’s been anything but.
“Now they have to be careful they don’t go too gung-ho and leave themselves too often at the back.”