Castleford have suspended Australian winger Justin Carney pending an internal investigation.
In a brief statement on the club's website, the Tigers say the 27-year-old Australian has been suspended with immediate effect.
"Castleford Tigers RLFC can confirm that Justin Carney has been suspended from the club with immediate effect, whilst an internal investigation is undertaken," the statement said.
SIGN UP NOW
Want to become a GMS writer? Sign up now and submit a 250 word test article: http://gms.to/haveyoursay4
"Castleford Tigers will not be making any further comment at this time."
Carney has been a huge success since he joined the Super League club on a two-year contract from Sydney Roosters almost three years ago.
The winger has scored 63 tries in 62 appearances despite serving five separate suspensions for foul play in his three seasons so far. He was in the Tigers team that lost to Leeds in the Challenge Cup final at Wembley 12 months ago.
Carney, who also played for Canberra Raiders, last year signed a new five-year deal with Castleford and recently expressed an interest in playing for England, for whom he qualifies under the residency rule later this year.
The announcement comes at a crucial time for the Tigers, who play third-placed Huddersfield in their next Super 8s match next Thursday needing a win to keep alive their hopes of a semi-final spot.