Andy Murray has accused the Lawn Tennis Association of failing to build on his successes the day after helping Great Britain to win their first Davis Cup for 79 years.

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Murray, who because of a packed schedule may play only one Davis Cup match next year, aired his frustrations at the LTA’s lack of forward planning and expressed his concerns at the absence of emerging players to one day fill his shoes.

“I feel like you waste time because nothing ever gets done and I don’t like wasting my time,” said the world No2. “I don’t know where the next generation are. They need to act on it now. It’s no use doing it in 18 months. Start now. It should have started before today. It’s time to make some positive changes so that things get better.”

Murray also made the startling admission that he had only spoken to the LTA’s chief executive, Michael Downey, for 10 minutes since his appointment in 2013. “I don’t speak to any of the people who are in a high-up position about that,” he said. “I haven’t really spoken to them about anything. It is a shame because we always had good juniors, regardless of whether we had a load of players at the top of the professional game. It’s concerning not to have any juniors in the grand slams because that is something we were always very good at. It’s not ideal.”

Murray, his brother Jamie and the other members of the squad, James Ward, Kyle Edmund and the unused doubles specialist, Dominic Inglot, along with the captain, Leon Smith, were still revelling in the euphoria of the achievement on Monday. But there was also an acknowledgment from Smith that the decision made by Downey and Bob Brett, the former head of player development who left his post in July, to stop using the £40m National Training Centre in Roehampton, south-west London, which opened in 2007, had backfired.

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“There’s so much change and every time you change, you have to start again,” said Smith. “When we had a squad at the National Training Centre, there was something to which you could attach younger players. It was the decision of Michael and Bob to move that on and now we’ve got another performance director who will have to unfold another strategy.

“The LTA doesn’t coach any of the players now and that is clearly the strategy since Michael came in. I would guess £25m has gone into junior programmes but it’s not worked, because there are no juniors.”

Murray was also critical of that decision, revealing that he had returned from a tournament in China in October only to find there was no one to practise with. “I was there on a Monday at about 3pm and then on Tuesday, at the same time,” he said. “There was not one person using any of the indoor courts and not one person in the gym. I took photos of it because the place cost, like, £40m and there are no people.

“There is nobody to train with when I am at home, nobody to practise with any more, which makes things frustrating. You want to have the best possible practice and training to prepare for the biggest events and we don’t have that anymore.”

Smith, who has led the team through 15 cup ties since his appointment in 2010 when Great Britain were on the verge of demotion to the competition’s lowest rung, has not decided about his future, although he still harbours ambitions of working as a coach on the ATP Tour.

Facebook Twitter Pinterest Andy Murray talks during a press conference in Ghent on Monday. Photograph: Jordan Mansfield/Getty Images for LTA

Downey, who said that Great Britain’s triumph in Belgium could help “drive interest in our sport”, regards Smith as “the best Davis Cup captain in the world” and wants to retain his services.

“I think the LTA needs all the best coaches they can get, really,” said Jamie Murray, who helped his brother record a crucial victory in the doubles in Ghent. “Leon’s obviously proved that he’s a great coach, a great leader as well. It would be stupid not to want to have him on board and taking British tennis forward.”