Rising four-year-old Enjin Number Nine is back in work and will be restricted to sprint races next season to avoid pulmonary overload.Trained by Mathew Ellerton and Mark Zahra, Enjin Number Nine captured the imagination with his sudden emergence as a stakes winner last autumn but suffered a bleeding attack when unplaced in the Group One Australian Guineas (1600m) at Flemington on March 5.Another bleeding episode would end his racing career in Australia.Zahra said Enjin Number Nine had a reduced

Rising four-year-old Enjin Number Nine is back in work and will be restricted to sprint races next season to avoid pulmonary overload.

Trained by Mathew Ellerton and Mark Zahra, Enjin Number Nine captured the imagination with his sudden emergence as a stakes winner last autumn but suffered a bleeding attack when unplaced in the Group One Australian Guineas (1600m) at Flemington on March 5.

Another bleeding episode would end his racing career in Australia.

Zahra said Enjin Number Nine had a reduced lung capacity as the result of an illness as a foal and the stable was mindful of carefully managing his race programs in the future.

"He will probably be kept fresh and run in the early sprints," Zahra said.

"We can't step him up in distance because when we tried to last time he started to buckle.

"He obviously had pleurisy as a foal and (his lungs) never developed properly.

"He sort of has half a lung really and that is the reason he bled that day in the Guineas.

"We have got to keep him fresh because he can't really cop the work."

Enjin Number Nine has won three of his six starts and went from a class one win at Geelong to landing the Listed Manfred Stakes (1300m) at Sandown in consecutive runs last campaign.

He finished fourth to Bullbars in his Guineas lead up, the Group Three C S Hayes Stakes (1400m) at Flemington on February 19.

Meanwhile Enjin Number Nine's Group One winning stablemates Crystal Lily and Response will return to Ellerton and Zahra's Flemington stables on Friday.

Crystal Lily will again target the premier sprints in the spring while Response will be aimed at slightly longer races.

Last campaign Response won the Group One Sportingbet Classic (1200m) in Adelaide but her logical spring target is the Group One Rupert Clarke Stakes (1400m) which she won last year.

"We have got to get her back out to 1400 metres again," Zahra said.

"Last time in we didn't run her in anything longer than 1200 metres but she was screaming out that she wanted 1400."