Three Indian shuttlers and a support staff had tested positive on Tuesday while a few were awaiting confirmation on their inconclusive samples, leaving the players without much practice.
BWF also informed that Badminton Asia Championships 2021 has been postponed.
Thailand Open: Shuttler HS Prannoy cruises to second round after hard-fought win vs Jonatan Christie
In the first game, Christie defeated Prannoy 18-21 but in the following two games, the 28-year-old put on some fine performances and ensured his spot in the second round.
The shuttlers can now train but only during the time-slots allotted to each team.
Having undergone coronavirus tests, Saina asked Badminton World Federation (BWF) to sort the mess as this will impact the performance of the players on the court.
In October, Sindhu had pulled out of the Denmark Open, one of the only two events to be held since March.
Badminton World Federation announces calendar for first half of 2021, India Open to be held from May 11
The USD 400,000 India Open will be the last of the 17 events to earn points towards sealing berths for the Tokyo Olympics.
Sindhu's father PV Ramana, who has often spoken on behalf of the shuttler dismissed media reports that she left because of an unspecified dispute in the family.
The decision to go ahead with the Denmark Open has left a few Indian players, including PV Sindhu, Saina Nehwal and Parupalli Kashyap, confused.