Liverpool boss Jurgen Klopp claimed Manchester United's defensive style was the "worst thing you can face in football" after the 0-0 draw at Anfield.
The Reds were unable to break down their stubborn visitors during a hard-fought 90 minutes on Merseyside.
Liverpool had the lion's share of the chances in the first half but struggled to test David de Gea when they got into shooting positions.
United stood firm in their 4-2-3-1 set-up and the likes of Luke Shaw and Victor Lindelof were standout performers on Sunday afternoon.
Klopp was left frustrated after the full-time whistle as he highlighted how the Red Devils crammed their "world-class players" behind the ball.
"We played football, tried to do it, force them back into their own box," the Liverpool boss told BBC Sport .
"The worst thing you can face in the world, in football is you play against a side with world-class players and they all defend with all they have, deep in the box and only counter-attack.
"It's really difficult – that's the biggest challenge"
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Despite United having one-third of possession and managing less than half of Liverpool's shots, they had the two best chances of the game in the closing stages.
Reds No.1 Alisson was forced into two good saves, first denying Bruno Fernandes then Paul Pogba from close range.
Assessing Liverpool's display, Klopp added: "The performance was good, especially the first half was exceptionally good.
"I think with all the things that were said before the game – 'United is flying and we are struggling' – and then playing this kind of game, I was really happy with that.
"We tried it in the second half again but you cannot deny United for 95 minutes, especially with the counter-attacking threat they have.
"They had two really good chances, I have to say, but we had our chances in the second half too."
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