Virgil van Dijk stated Liverpool had room for improvement despite a 3-0 win at Norwich City on his long-awaited Premier League return.
Van Dijk was playing a competitive match for the first time since suffering a serious knee injury in a collision with Jordan Pickford during the Merseyside derby against Everton at Goodison Park last October.
Goals from Diogo Jota and Roberto Firmino either side of half-time put Liverpool in control before Mohamed Salah established a new Premier League record by scoring for a fifth consecutive opening weekend.
The Reds were able to close out a clean sheet but a final Opta expected goals (xG) calculation of 1.6-1.4 in Norwich's favour suggested Liverpool rode their luck at times and Van Dijk certainly thought this was the case.
"Winning here 3-0 sounds comfortable but at times we made it difficult for ourselves," he told Sky Sports.
"Maybe that's fatigue, we have to do better. But we can’t be negative about tonight.
"I need games. The manger knows it, I know it. It's time to recover and hopefully I'm ready for next week and it’s going to be a very tough one again against Burnley."
Van Dijk explained how tough it was to watch on from the sidelines as an injury-ravaged Liverpool squad saw their title defence subside last time around.
"In the beginning, mentally it’s tough," he said. "You are going from one day being fully fit to the next day you can't walk, you're full of medication and you can't sleep.
"Everyone has their opinion and you read those things because you have nothing to do.
"We struggled last season with key injuries in key positions. We couldn't play our game with high pressure. When you have midfielders playing centre-back it's not easy and the guys did a fantastic job coming third."
In terms of whether Liverpool can mount a sustained title bid against the likes of champions Manchester City, Manchester United and European champions Chelsea this time around, Van Dijk was keen not to be drawn – instead focusing upon his excitement over being back in the heat of battle.
"I don't know. The only thing we can focus on is the next game," he added, having topped the Liverpool charts for touches (92), passes (85) and successful passes (79) over the course of the 90 minutes.
"I think it's exciting to see the Premier League like this. The quality that the Premier League has with the players coming in and coming back is exciting.
"I enjoy that. If I'm thinking about our team, if we stay fit, we have a good chance to be up there. We'll see what the season brings, we have to enjoy it.
"To play against world class strikers and world class teams against where you can't predict. It’s amazing."