"We didn't play well, especially the first half, but we were much better in the second half," said the boss.
"We pushed harder and had more options in the final third, but clearly we have to improve if we want to win these kind of games.
"We have to improve in the middle and keep the ball more and pass it better. The understanding has to be better. As a team we were not comfortable in possession in the first half.
"We were playing against a good team so we knew we needed to play well. We didn't but we have another game on Wednesday against Stoke and we have to improve."