Castleford Tigers have confirmed that three members of the First Team squad have received a positive result in the weekly round of Covid-19 tests conducted at Super League clubs.
These players are now self-isolating in line with government advice.
As part of the track and trace protocols, a further six members of the Tigers squad have been stood down.
The Tigers squad will not be tested again until Friday morning.
This leaves the Tigers with only 14 fit players for their match on Thursday against Leeds Rhinos. A further three players will be assessed to see if Castleford can still play the fixture.