Liverpool midfielder Fabinho admits facing Cardiff City was an eye opener.
Fabinho started for the 4-1 win on Saturday.
"The match was rough," he continued. "We scored one during first half, which was important, but the match was very intense in the midfield.
"After we scored the second goal, we thought it would be easier but they scored after.
"Only at the last 10 minutes that we could get an easier game and scored the third and fourth goals.
"This is Premier League, I'm still learning day by day how rough the games can be. I'm happy we did it."