Striker Steve Morison says Wales proved a point in their 2-1 victory over Scotland in Cardiff on Friday.
The Welsh had been without a win since Chris Coleman took over as manager in January and needed a late Gareth Bale brace to beat the Scots.
But Norwich forward Morison thinks they were good value for the win and that they can look forward to the rest of their World Cup qualifying campaign with confidence.
"We always had the belief," he said. "We kept it from the games when we had been winning, even though we had lost a few. We have a great spirit and a great camp and we enjoy getting together.
"Everyone is turning up, which is fantastic. We will carry it on until Tuesday night and hopefully we can put on a good performance in Croatia.
"We have always been behind Chris and I think we showed that we are a very good team. I thought we made Scotland look very average.
"I always thought we had a chance. We were the better team from start to finish and we should have won a lot more comfortably. As long as we win the games, it doesn't matter."
Wales have confirmed that Dave Edwards of Wolves will replace the suspended Aaron Ramsey in the squad for Tuesday's match in Osijek against Croatia.
Croatia will be tough
Croatia are joint-top of the group alongside Belgium and Morison is expecting a tough night.
"I don't think they are ever nice places to go to," said Morison. "They are very, very hard places to go to and get results.
"But going there off the back of a win will make it a little bit easier. We have only played three games and there are a lot of games to go.
"We've got to play everyone again so, if we can go on a run, you never know what might happen."