Andy Murray says he is concerned that British tennis has not built on the legacy produced by his achievements and those of his brother, Jamie.
The Scot is considering hip surgery to improve his quality of life and perhaps give him the chance to extend his career.
But should he be forced to quit, perhaps at Wimbledon this summer, he is worried that not enough is being done to produce more players at home.
“I am not sure Britain has really capitalised on the last seven or eight years of success that we've had really, whether it be myself, my brother, Jo [Konta], Kyle [Edmund], Davis Cup, those sorts of things. I'm not sure how much we've done there,” he said.
“We've obviously got a few players here, Kyle, Cam Norrie, Dan Evans, Harriet Dart, Jo, Heather [Watson], Katie Boulter, so there are quite a few players coming through that have potential to go on and do better.
“To get eight Brits in the main draw, that is a decent number. It's not amazing, but it's a decent number. But I think the thing that is more concerning, from my understanding, is that participation is dropping.”
Murray said the lack of indoor facilities in Scotland – no public indoor courts were built between 2006 and 2016, the year both Murray brothers reached world No.1 – was of crucial importance.
“That seems madness,” he said. “I don't understand why that is. Those are the things that are important for the future. You need to get kids playing, you need to have the facilities that allow them to do that.
“Maybe it's something I should have given more thought to while I was playing but I never felt that was my job to do that.
“It is a little bit disappointing. I don't understand how in the last eight to 10 years that participation is dropping, I don't get it. If that is the case, it's disappointing.”
Judy Murray has been trying to get approval and funding to build a public indoor sports centre near Dunblane, something to celebrate the efforts of her sons.
“It would be great to say that here’s the legacy from what Andy and Jamie have achieved,” she said.
“Here’s the centre and here’s the café that’s done up like a Hard Rock Café and it’s got all their tennis rackets and their kit and their stories and their drawsheets and everything all around it.
“For me that would be the great thing. The worst thing would be that it doesn’t happen and we’ve got nothing to show for what we’ve done, because I am not seeing anyone else doing anything, there isn’t anything else in the pipeline and you have to prepare for a legacy.”
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