Rohit Sharma, Rishabh Pant, Shubman Gill, Prithvi Shaw and Navdeep Saini have been placed in isolation after a video surfaced on social media showing the players eating at a restaurant in Melbourne.
The five players have been separated from the Indian squad and will be allowed to train while adhering to the bio-security protocols imposed by the host cricket board.
"The BCCI and CA are investigating the matter and seeking to determine whether the outing constitutes a breach of biosecurity protocols," Cricket Australia said in a statement.
"In the interim, on the advice of the Australian and Indian medical teams, the aforementioned players have been placed in isolation as a precaution.
"This will include separating the group of players from the broader Indian and Australian squads when travelling and at the training venue."
The controversy emerged when the five players were spotted sitting at a table inside a Melbourne restaurant with the video of the individuals posted on the Twitter account of Navaldeep Singh.
<blockquote class="twitter-tweet"><p lang="en" dir="ltr">Bc mere saamne waale table par gill pant sharma saini fuckkkkkk <a href="https://t.co/yQUvdu3shF">pic.twitter.com/yQUvdu3shF</a></p>— Navaldeep Singh (@NavalGeekSingh) <a href="https://twitter.com/NavalGeekSingh/status/1344905833801367552?ref_src=twsrc%5Etfw">January 1, 2021</a></blockquote>
Singh's viral Twitter thread mentioned his interaction with the players including a friendly embrace with Pant but the online user later denied the hug took place and assured he maintained distance with the cricketers.
The ongoing four-Test series between Australia and India is being held amid the backdrop of the coronavirus pandemic with tighter restrictions in place when the teams travel to Sydney, New South Wales for the third game.
New South Wales has recently made masks compulsory in light of the new cluster of coronavirus cases in the state.
According to the bio-security protocols set by Cricket Australia for their stay in Melbourne, players and staff can leave the hotel premises but can only dine outdoors.
Earlier, CA had fined Brisbane Heat duo Chris Lynn and Dan Lawrence for violating the bio-security rules in the start of the Big Bash League (BBL). England paceman Jofra Archer was slapped with a one-Test ban for a bio-security breach in the international summer at home.
The Board of Control for Cricket in India (BCCI) have not yet communicated any response to the developments as a cloud of uncertainty hovers over the availability of the five touring players. Out of the five, Rohit had just joined the team in Melbourne after completing his mandatory quarantine and was appointed the Test vice-captain.