Captain Ashley Williams insists Wales can still qualify for the World Cup.
Wales left themselves a mountain to climb by winning just one of their opening four qualifying matches.
The 2-1 win over Scotland on Friday night puts them seven points behind Tuesday night's opponents, joint group leaders Croatia but Williams says another victory in Cardiff will keep them in the mix.
"It keeps it alive for us. We have never said we could do anything after the start we had but we have always got that hope," he said.
"We just need to keep picking up points. There are plenty still to play for. We are on a decent run of form, which bodes well. We did well in the friendly the other day, so we have got two wins on the trot now.
"Scotland are a good team, and to go there on a night like Friday was massive. It showed the character of the team that we were able to come back from a goal down.
"But we just need to keep it going. We have got Croatia on Tuesday and that will be another tough one."
"The win over Scotland was a very important for us. We need the points and there was a little bit extra riding on the game because it was against one of the Home Nations. It was massive."
Gareth Bale limped out of the Scotland clash at half-time but Williams says they have proved they can win without him.
"But we showed we can cope without Gareth. He dug in at Hampden and gave it a go but you could see he wasn't himself. He tried for 45 minutes but it wasn't right," he said.
"But after that we came through and no-one can say we are a one-man team. We were a goal down and came out for the second half without him. But we got the result and everyone played their part.
"That's the best I've seen from a Wales team. That is us at our best. That is how we want to play.
"We kept the ball well and didn't let Scotland settle on it. We won it back early and that is what we are supposed to do.
"We dropped off a bit towards the end of the half and they scored but in the second we controlled it pretty well.
"If we can play like we did for the first 25 minutes for a full game, we'll be a match for anyone."