Kembla Grange trainer Michael Tubman has been stood down following the alleged discovery of EPO in his stable.

Acting on advice from NSW Police, Racing NSW stewards went to Tubman's stable on June 14 and discovered several substances, one of which was later identified as "containing an Erythropoiesis - stimulating agent (EPO)".

Analysis of the other substances is continuing.

Tubman has five days to make submissions why his licence should not be suspended beyond the interim order.

"Having regard to the seriousness of the charge issued, Racing NSW stewards have placed Mr Tubman on notice that they are giving consideration as to whether the provisions of AR23 ought to be enacted, pending the hearing and determination of the charge issued," a stewards' statement said.

"The provisions of AR23 have been imposed on an interim basis, pending consideration of any submissions or evidence provided on behalf of Mr Tubman.

"Accordingly, Mr Tubman's trainer's licence is currently suspended on an interim basis. At this time Mr Tubman is not permitted to nominate, accept or start a horse in a race or barrier trial, nor work any horse being trained by him on a registered racecourse or training facility.

"He will, however, be permitted to continue to provide care for his horses during the next seven days."

Tubman is best known for training the 2010 Silver Slipper winner Chance Bye, a $15,000 yearling who earned in excess of $500,000.