Two Queensland Racing Integrity Commission stewards are recovering after they were allegedly assaulted during a stable inspection at Toowoomba.

The stewards, from the commission's Integrity Regulation Unit, were conducting an inspection at a Toowoomba property on Tuesday when they were approached by an industry participant.

It is alleged the man, who is known to the stewards, sprayed an unknown liquid into their eyes.

It's further alleged he then stole the keys from a QRIC vehicle and drove off in his own vehicle.

The stewards were picked up by an ambulance and transported for medical treatment.

A 73-year-old man is wanted for questioning with detectives from the Queensland Racing Crime Squad investigating the incident with the assistance of Toowoomba police.