Saina is going through the toughest phase of her career and needs to take care of herself so as to avoid any more defeats, says the former national champion and coach.
It was Saina's fourth straight loss to world No. 12 Busanan.
Parupalli Kashyap exited from the tournament after he retired in the third game of his first-round clash against Canada's Jason Anthony Ho-Shue owing to a calf injury.
It was a chaotic day and the entire procedure put us under severe mental stress, the duo told Malayala Manorama.
Both the Badminton World Federation (BWF) and Badminton Association of India (BAI) confirmed the development.
Saina's grievances was chiefly about players allegedly not being allowed to interact with their physios and trainers and the reduced practice and gym timings allowed.
They will compete in back-to-back BWF World Tour Super 1000 events in Thailand.
The withdrawal of former world No.1 Saina means there will be no Indian participation in the women's singles event at Odense as world champion P V Sindhu has already opted out.
Strict safety protocols were being followed in the camp in Hyderabad, the Sports Authority of India said.
Kashyap pointed out that there is still no scope for practice amid the coronavirus pandemic and the BWF has drawn out a calendar made of 22 tournaments across the world in five months.