Hull KR have suspended two first-team regulars indefinitely while they investigate a police chase that ended with a car driven into a wall at the weekend. The police are also investigating.
Rovers' coach Justin Morgan says he is not expecting to have Ben Cockayne or Liam Watts available for the foreseeable future. The club say they will make no further comment until their inquiries are complete.
"It will be very thorough and fair, but it's not something I'm involved in," Morgan said.
The 27-year old Cockayne has had previous disciplinary problems since joining the Robins from Doncaster in 2006. In 2009, he was given a 12-month suspended sentence for assault and was suspended for two months by the club.
Earlier this season, he was described as being "on his last chance" when he embarrassed the club with an allegedly racist posting on Facebook.
Watts, aged 20, was Super League's Rookie of the Year in 2009. Both players were in Rovers' team that won at Harlequins on Saturday.
Warrington have moved to fill the gap in their import quota left by Matt King's signing for South Sydney by recruiting the Penrith and Australia back-rower Trent Waterhouse on a three-year contract from next season. "He's a high-quality international who fits our needs," said Warrington's coach, Tony Smith.