Andy Murray may need to adapt his game in his recovery from a long-term hip injury, according to his former coach Miles Maclagan.
The 30-year-old has withdrawn from the Brisbane International and says he may have to consider surgery.
Maclagan describes the situation as "concerning" but says the world number 16 can come back a different player.
"If he can get fit, it might force him to play a different sort of game, with shorter rallies," Maclagan said.
"That could be very exciting, [but] he's got a tough road back.
"The characteristic of these great players is that when they've had a setback they often come back stronger, reinvigorated in the mind.