Liverpool keeper Loris Karius believes Manchester United played so defensively against them because of the progress the Reds have made under boss Jurgen Klopp.

The goalless draw at Anfield was memorable only for two second-half David de Gea saves as Jose Mourinho set up his side to frustrate.

"They know we're a really strong team, so that's a compliment for us," said the German, who kept his first clean sheet since taking over from Simon Mignolet despite a couple of shaky moments personally.

"United maybe waited for the one chance to get a goal, as obviously their priority was to stop our play, our attacks.

"We knew we had to be patient because it was going to be tough.

"Second half we managed better to get through but United defended well with De Gea making top saves."