Great Britain captain Anne Keothavong says the lack of top-20 players at the Billie Jean King Cup is "a tennis problem, not a player problem".
Only three of the world's top-20 will compete in this week's qualifying rounds, with Poland's Iga Swiatek and American trio Jessica Pegula, Coco Gauff and Madison Keys among those absent.
World number two Swiatek withdrew last week, saying she needed time to "focus on myself and my training".
Britain, meanwhile, are without Emma Raducanu, who has opted to train and "look after her body" after her Miami Open quarter-final run in her seventh event of the year.