Chris Coleman admits Wales will have no hope of reaching the 2014 World Cup if they repeat their poor performance against Bosnia-Hercegovina.
lost 2-0 to Bosnia
at Llanelli's Parc y Scarlets in their final match before the qualifiers.
Wales begin their campaign against Belgium in Cardiff on 7 September.
"There are not many positives we can take from that. It was a disappointing performance. We are a lot better than that, we know that," Coleman said.
"If we're not then we're not going to be going anywhere," Coleman said.
Coleman is still searching for his first win in charge as Wales fell to their third successive defeat of 2012.
Goals in each half from Veded Ibisevic and Miroslav Stevanovic secured the visitors a deserved victory.
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“The boys have been through a lot to be fair to them. We've only been together twice, this time for two days. "But I thought we had enough quality to do better than we did”
"I'm disappointed but it's the start of the season for most of our lads," said the former Wales defender.
"It's probably the toughest game most of them have had since they've been back pre-season.
"We looked rusty [and] we looked nervous for some reason.
"I'm not going to take anyway from Bosnia - they're a good team. But we can be better than that.
"The boys have been through a lot to be fair to them. We've only been together twice, this time for two days.
"But I thought we had enough quality to do better than we did."
Coleman's starting line-up included three players who featured for Great Britain at the Olympics - captain Aaron Ramsey, Joe Allen and Neil Taylor.
Wales' fourth Olympian, Craig Bellamy, started on the bench following his recent exertions with Team GB and move to Cardiff from Liverpool.
Bellamy came off the bench to replace Reading striker Simon Church on 62 minutes to win his 70th Welsh cap.
"We could not start with Craig, he has had a lot going on and he has a game on Friday night for Cardiff who are starting their season," added Coleman.
"So we need to try and play the game with the clubs. He is playing on Friday, he has had an on-off move to Cardiff over the last 10 days and done a lot of travelling.
"We thought 30 minutes would be enough for him. I don't regret it. I have to build up relationships with the clubs as these are not our players.
"We are borrowing them and we need to be sure we send them back to their clubs in good nick.
"In an ideal world he would have started, but that was not the case. If we had been playing for points tonight we would not be having this conversation."
Tottenham's Gareth Bale started his first game under Coleman but was withdrawn just after the hour mark, holding his back.
But Coleman believes the winger should be fit for Tottenham's opening Premier League match of the season at Newcastle on Saturday.
"He has had problems with his lower back and hamstring and it was sod's law he lands on his lower back but we think he is all right," Coleman said.