Hong Kong Jockey Club stewards announced on Monday trainer Andreas Schutz will face an inquiry after one of his horses returned a positive drug test last month.
Schutz's Eagle Spirit, which was entered for a Class Four 2,000m race on March 30, was withdrawn after a prerace urine sample showed traces of the prohibited substance phenylbutazone, an anti-inflammatory drug.
Post-race urine and blood samples were taken, and both confirmed the presence of the substance, but independent testing of the unused "B" sample had yet to take place. A date is yet to be set for the hearing.
Meanwhile, Neil Callan will be free to ride at Sha Tin on Sunday after lodging notice of his attention to appeal a five-day suspension incurred at Sunday's Sha Tin meeting.
Callan and Eddy Lai Wai-ming were both suspended after an improper riding incident between the 1,100m and 1,000m in the Jianguomen Handicap.
Lai (Golden Deer) shifted in on Callan (Griffindor), who became unbalanced and crowded the eventual winner Jaeger Bomb, who was on his inside. But as he recovered his own balance, Callan extended his elbow, making contact with Lai's torso.
Lai, who has been charged with improper riding before, received seven days and did not lodge an intention to appeal within the 24-hour window.
Callan's ban, which was due to start after Wednesday night's meeting at Happy Valley, will be held over until the appeal is heard.
A notable absentee from Happy Valley will be Tye Angland, who has been granted permission to miss Wednesday night's meeting.
Angland will attend Tuesday's funeral for jockey Nathan Berry, who died in Sydney last week after a short illness, but will return to Hong Kong on Friday in time to ride at Sha Tin this weekend.
