Ronald Koeman's side booked their place in the tournament with a goalless draw with Northern Ireland.
"We wanted to win today and we had chances. We knew it would be difficult but in the end we qualified - how doesn't really matter very much.
"In the last 15 minutes, Northern Ireland started to play more directly, hoping for free-kicks and corners. It was up to us to stay sharp and we did very well at times.
"We are going to the European Championship, let's just enjoy it now. We will prepare ourselves well for that."