Mornington trainer Jason Warren is facing two charges from Racing Victoria stewards relating to an investigation into betting irregularities concerning his runner Baron Archer at Echuca on March 8.

Warren has been charged with failing to notify stewards that the horse had undergone throat surgery before his first-up run, and for false and misleading evidence.

Fairfax Media reported on Wednesday that significant money was invested with betting exchange Betfair on Baron Archer to lose. Baron Archer started a $2.80 favourite and ran third.