The 24-year-old made his Betfred Super League debut in the Tigers’ 28-12 defeat at Wigan last Friday and would have been in line to make his home bow in Friday’s derby against Wakefield. Castleford say they have stood the player down but did not go into further details.
A statement from the Tigers said: “The club understands from speaking with Garry Lo that he is voluntarily assisting the police with an inquiry. Garry will be stood down for selection today, for Friday’s game. This is not an admission of wrongdoing but simply to ensure that Garry is able to cooperate fully with the inquiry and to ensure the best interests of everyone, including Garry, are maintained.
“There will be no further comment at this stage from the club or player.”
Lo, who played for his country in the 2017 World Cup, joined Castleford on a two-year contract from Sheffield Eagles last September after scoring 33 tries in 28 Championship matches last season.
He returned to the Eagles on loan at the start of the 2018 season but stepped into the side in the absence of James Clare with a fractured tibia.
Clare is set for a two-month lay-off, and stand-off Ben Roberts (calf) and forwards Alex Foster (calf) and Nathan Massey (shoulder) will also miss Friday’s game due to injury.
Coach Daryl Powell is set to recall second-row forward Jesse Sene-Lefao after a six-week injury absence while academy player Calum Turner gets a first call-up.