Craig Newitt has found the key to Danger Close but trainer Jason Warren is confident the sprinter's winning run can continue at Caulfield with a new jockey.

With Newitt riding in Brisbane on Saturday, Steven King takes over on Danger Close as the gelding steps to open company aiming for his fourth-straight win.

Danger Close and Bel Sprinter's younger brother Bel Rain were both scratched from races at Flemington last Saturday when the track was downgraded to slow, with Warren preferring to wait to get the pair on firmer footing.

King rode a winning double at Flemington last Saturday, including Longchamp Belle for Warren which led to him getting the ride on Danger Close in Saturday's 1000m handicap.

"Steven rode Longchamp Belle to victory for us at Flemington so we'll repay him with another nice ride," Warren said.

Newitt, who rides Moriarty in Saturday's Group One Doomben Cup, has ridden Danger Close seven times for four wins including his past three in restricted city races over 1000m.

"We needed to find a replacement and I don't think we'll lose much with Steven King," Warren said.

Danger Close, who has been finishing strongly to win his recent races, has to contend with a wide gate and is a $10 chance with three-year-old Lord Of The Sky, who Danger Close narrowly beat at Flemington on Anzac Day, the clear-cut $2.60 favourite.

Bel Rain won a Geelong maiden in comfortable fashion on debut and is set to make his first city appearance in the Taralye Get Deaf Kids Talking Plate (1200m).

Warren wants to increase Bel Rain's rating during the off-season to give him the chance to contest better races next season.

"Hopefully he can do that on Saturday and take that next step," Warren said.

"He's in good order.

"Ideally I would have liked to have had him in that 1400-metre race last Saturday but it wasn't to be."

Daniel Stackhouse rode three-year-old Bel Rain to his debut victory and believes the colt will keep improving.

"He was still very raw (when he won at Geelong)," Stackhouse said.

"That was the third time I had ridden him and from the first time to that time he was a different horse.

"He had just improved so much. He's just such a green, raw type. With time he's just going to get better and better."