Liverpool boss Rafa Benitez conceded his side has to improve after our 2-1 win on Sunday.
Goals from Benoit Assou-Ekotto and Sebastien Bassong secured the points in the Barclays Premier League opener. Steven Gerrard replied from the spot for the Reds.
Benitez said: "We did not play well in the first half, but were much better in the second, when we pushed harder and had more options in the final third.
"Clearly we have to improve if we want to win these types of games.
"We have to improve in the middle, keeping the ball. The understanding has to be better.
"But it is too early, and we have another game on Wednesday when clearly we have to improve in the possession."
Benitez was far from impressed with the officials, claiming this his side could have had two more penalties late in the game - handball against Assou-Ekotto and another claim against Assou-Ekotto when he eased Andrei Voronin off the ball.
"Everybody could see there was a penalty against Voronin. It was so clear, it is unbelievable," he said.