"Coming here and winning an away game in the Champions League is tough," he told BT Sport.
"Benfica fought for their lives, we gave them a little bit too much but they deserved the goal as well, even though we could have defended better - they had counter attacks, it is not easy to keep the ball all the time and the more risk you take, they have really good players.
"It was a tough game, what I expected, the crowd was there, we knew 2-0 is nothing, nice but not more. They score the goal and it was much more open than we wanted but the goalie was probably the best player and made a couple of really good saves - we are two goals up, half-time, let's keep going.
"We usually score more [in those situations] but we didn't, mainly because the goalie, credit to him, and that is pretty much the story. We could have scored in the last minute, 4-1 would be nice but we are not in dreamland here.
"We know much more about our opponent, they won at Ajax, we are aware of the quality and have a nice game in between but then we will be ready again."
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