Chris Coleman hailed the courage of his players for claiming a victory on a pitch he said was "not up to the standard of a UEFA qualifier"
Wales live updates
Wales have been drawn in Group B alongside top seeds Bosnia-Herzegovina. Scotland, meanwhile, face Germany, a much tougher task.
Wales will face Holland in a friendly in Amsterdam in June, the Football Association of Wales has announced.
The Dutch will use the fixture, set for Wednesday, June 4 at the Amsterdam Arena, as part of their final preparations for their World Cup campaign in Brazil.
Chris Coleman admits he would be prepared to allow Gareth Bale to sit out Wales friendlies in the future as he seeks to nurture a strong working relationship with Real Madrid.
– Wales manager Chris Coleman
To be fair to him, in my two years the only friendly he missed was against Mexico with a back injury. He was there for the games against Bosnia and Austria.
But he's playing a lot of games in Madrid. We have to look at it long-term as well.
If he's fighting fit then great, we expect him to be here. If he's fatigued, then we might rest him.
He's going to get a lot of extra attention and if he's feeling fatigued or tired, physically or mentally, as much as I want him on the pitch maybe, depending on who we are playing against in a friendly, we could rest him.