Liverpool manager Jurgen Klopp appeared less than impressed with the way Manchester United set up for the side's 0-0 draw on Sunday.
Klopp's men dominated possession and had far more shots on goal, but it was United who had the best chances and would have walked away with all three points if goalkeeper Alisson had not been on his toes.
"We played football, tried to do it, force them back into their own box," he said. "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."
Liverpool failed to break down United's stubborn defence, meaning they are now on a run of three consecutive games without a goal, but Klopp insisted he is not worried by the Reds' struggles in front of goal.
"There is nothing fundamentally different, it's just the result is different," Klopp stated (via the club's official website). "We try and we don't score or we try and we score – that's a big difference, to be honest.
"It's not that we ignore the fact and just hope it will be good again. We did that but the only possibility you have to score goals is to create situations and to be ready to fail and to do it again. That's a massive difference between when you are flying and you score with pretty much each chance you have because then you deal with the missed chances better. It is just information. That is the difference and nothing else.
"I saw my team playing tonight and I saw a really good football team with a clear idea, with super passes, great counter-press and great desire to score – but we didn't score. We will create chances and we will score, but I know, now we face Burnley on Thursday and they are not famous for conceding an awful lot of goals. Then a few days later we play again against United and they obviously defend with all they have.
"It is not that we just decide from now on we want to score again and now we will do it, but I see the boys really in the situation and I will help as much as I can so that we change it as quickly as possible."