"There's still a long way to go, but I think we have done really well so far," said the Dutchman.
"Of course everyone is talking about the pressure if you lose a game, but in football you will always lose some games. You just have to think about winning the next game, I think that's the most important thing for us.
"Tomorrow is a very important game for us because we want to reach the next stage of the Champions League and finish first in the group.
"I think we played a really good first half in the match over there and it was a pity that we gave a goal away in the last 10 minutes of the game.
"We need to learn from that, we've got a good team and we don't want to be conceding goals late in games."