Sydney trainers will need to start 25 per cent of their stable at city racetracks as well as win a minimum number of races to keep their metropolitan status under new Australian Turf Club criteria.

The ATC has released performance standards which trainers with stables at Randwick, Rosehill and Warwick Farm will have to meet, starting from the new racing season on August 1.

ATC executive general manager racing Matt Rudolph said the criteria was "scalable" to ensure smaller trainers weren't driven out of Sydney racing.

"We are confident that the vast majority of trainers will be able to meet the requirements for the number of starters and winners on our metropolitan tracks," Rudolph said.

Trainers will also need to maintain a minimum strike rate.

Over a 12-month period they will need to win races equating to 25 per cent of the number of boxes they hold.

A trainer with eight boxes will need two city winners each season while a bigger stable of 64 has to win at least 16 races.

Randwick trainer Kevin Moses says the criteria sounds "pretty fair" but he does fear it will drive out some of the industry's most respected trainers.

"They are trying to push out the little trainers, some of who have been there for a long time," Moses said.

"People like Les Bridge, Pat Webster, Greg Lee, Robert Pearse, Craig Carmody and myself, we all started there (at Randwick) as apprentices."

Moses also said the ATC needed to factor in the time it takes to get a horse ready to race once it arrives at the stable.

"People don't understand it takes three months to get a horse ready," he said.

"I've got 18 there now and I've got nine horses that haven't even trialled yet."