"It is critical that the image, interests and integrity of thoroughbred racing in New South Wales are not compromised while Mr Weir's conduct is further investigated".
Melbourne Cup victor Prince of Penzance, who was famously partnered by Michelle Payne to become the first woman to win the coveted prize.
"The stewards also have significant concerns regarding the negative adverse publicity relating to police involvement in relation to Mr Weir and Mr McLean's training activities is having on public confidence in racing".
"If the allegations are true, and clearly there's been breaches already through what they've found with electrical devices, I would be most surprised if he was (training by the end of the day)", Tom Dabernig told 3AW on Friday.
Lindsay Park co-trainer Tom Dabernig says his public comments putting a question mark against Darren Weir's achievements weren't meant to be a personal attack.
"He should be stood down and not have runners until it's looked into; it's not fair on the participants and the general public but that's not a call for me to be making", he said.
Trainers Darren Weir and Jarrod McLean have had their horses scratched this weekend after they were charged by Racing Victoria stewards on Friday afternoon. "This matter brings into questions the result of the 2015 Melbourne Cup", said Elio Celotto of the coalition.
Weir's future should be made clearer on Friday, with stewards at the governing body expected to provide an update after considering information and seeking legal advice.
Dabernig, who trains in partnership with David and Ben Hayes, said on Saturday that he spoke with the best interests of racing at heart rather than any personal grudge with Weir.
Racing NSW said the notice was issued "in light of the seriousness of the reported allegations concerning Mr Weir and the responsibility of Racing NSW to protect the image, interests and integrity of racing".
Racing Victoria stewards have charged top Australia gallops trainer Darren Weir with six offences under the rules of racing and asked him to show cause as to why he should not be suspended pending the hearing of those charges.
Investigations are understood to focus on the use of electric shocks and strikes with a whip to horses as they run on the treadmill while wearing blinkers.
The trainer was arrested, questioned and released without charge on Wednesday after the raids at Ballarat and Warrnambool.
Darren Weir has been charged by Racing Victoria.
At a press conference, Victoria Police assistant commissioner Neil Paterson confirmed four "jiggers", which are taser-like devices, an unregistered gun and a substance believed to be cocaine had been seized.