The Reds face Norwich this weekend.
"Very impressed," the centre-back told liverpoolfc.tv. "I think everyone expected them to go down. Or have a real fight on their hands but they've come through it. They've kept a lot of the players who came up with them.
"I think they've got a lot of British players who have come through there as well. Credit to them and credit to their manager - he's probably in the run-in for Manager of the Year. It will be a very difficult game. It was a difficult game at home against them, so it's going to be even more difficult at Carrow Road."