Jurgen Klopp believes Manchester United have progressed under Jose Mourinho but his Liverpool side will give them their biggest challenge.
The Reds travel to Old Trafford without a win in their last three matches in all competitions, while their arch-rivals have won nine on the spin.
However, Klopp seemed to question the quality of their opponents in that winning run.
“They are better and more used to each other,” said Klopp ahead of Sunday’s showdown.
“Henrikh Mkhitayran is there, I am not sure if he was fit or just out of the squad when they came here [in October].
“I hear when I talk to different people that because of our last game it is ‘oh my god, it is Manchester United next’ and all that stuff.
“Give me 11 players and we will be competitive!
“They deserve the run they’ve had. But in the games they have won recently they haven’t won against us.”
Klopp was also asked about his rivalry with Mourinho, but insisted that the two managers alone will not decide Sunday’s result.
He added: “He’s top level. That’s not new. We have same kind of angriness in us. We want to go there and get a result.”
“We go there for a result. No other reason. We were ready for the game [in March] and we will be ready again. I don’t think that Jose or myself wanting to win can make the difference.
“The players have to perform, that’s how it always is.”