The Bulldogs have been banned from training following a biosecurity breach at a training session on Thursday.
Canterbury great Terry Lamb was filmed shaking hands with players during a training session on Thursday, clearly breaching biosecurity guidelines and will now be tested for coronavirus.
Lamb is not one of the 50 players and staff cleared to attend trainings or games and the incident will now be investigated by the NRL's integrity unit.
The side have been banned from training until Lamb's test results are returned.
"On the advice of biosecurity experts, Terry Lamb will be tested for COVID-19. The Bulldogs will not train until the test results return tomorrow," an NRL spokesperson said.
The Bulldogs have since apologised for the incident.
The strict biosecurity guidelines implemented by the NRL state that all 50 players and staff are required to self-isolate at home where there is to be no contact with anyone outside of their "bubble", aside from NRL approved people within their homes.
While media and other club staff are able to attend training sessions, they are not allowed within "clean" zones at games and training sessions.
This is the first serious breach of the guidelines since training recommenced a month ago.
The Bulldogs, who are yet to post a win this season, are due to face St George Illawarra on Monday.