Cancer-stricken Chong Wei is planning to start training as early as next month and make a competitive comeback to the tour at next year's All England Championships.
Hendrawan revealed he was shocked when he heard about Chong Wei's conditions but insisted that the Malaysia great has been responding well to treatment in Taiwan.
The 35-year-old Malaysian shuttler, who had missed the world championships and Asian Games campaigns earlier this year, is responding well to treatment, according to Badminton Association of Malaysia.
India's first female Olympic silver medalist, Sindhu earns $8m from endorsements, which is only behind tennis superstars Serena Williams and Maria Sharapova.