Novak Djokovic said that sport needed "legend" Rafael Nadal to make another comeback after it was announced that the injury-plagued Spaniard had withdrawn from his season-opening tournament in Brisbane.
Nadal said that he would not play in Brisbane because of a left thigh strain, prompting yet more fears over the 32-year-old's long term future in tennis.
Nadal, who claimed his 17th Grand Slam title at Roland Garros last year, has not played a competitive match since September.
He also lost the world number one ranking to Djokovic, whose battles with the Spaniard are one of modern sport's greatest rivalries.
"He has done the comebacks for so many times in his career that you always believe that he can do it again," said Djokovic after reaching the Qatar Open quarter-finals on Wednesday.
"He has a very physical style of tennis which obviously is putting a lot of load and pressure on his joints, on his knees.
"Sport needs Rafa, no question about it. He is one of the greatest legends of all time and we want to see him play."
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